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// Set up the image files to be used.
var theImages = new Array()
var theCaptions = new Array() // do not change this
// To add more image files, continue with the
// pattern below, adding to the array. Rememeber
// to increment the theImages[x] index!

theImages[0] = '<a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Clapp,%20F.G.%20295"><img src="images/BWmainImage_cfg00295.jpg" alt="Castillo de San Marcos National Monument, Florida. Interior view of Fort Marion which is built of coquina. Circa 1907."></a>'
theCaptions[0] = 'Castillo de San Marcos National Monument, Florida. Interior view of Fort Marion which is built of coquina. Circa 1907. ID. <a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Clapp,%20F.G.%20295" class="links">Clapp, F.G. 295</a><br>'

theImages[1] = '<a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Capps,%20S.R.%201127"><img src="images/BWmainImage_csr01127.jpg" alt="William T. Mulkey, Jack Rimmer, and Jack Lean. Denali National Park and Preserve, Alaska. cc 1919."></a>'
theCaptions[1] = 'William T. Mulkey, Jack Rimmer, and Jack Lean. Denali National Park and Preserve, Alaska. cc 1919. ID. <a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Capps,%20S.R.%201127" class="links">Capps, S.R. 1127</a><br>'

theImages[2] = '<a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Hillers,%20J.K.%20%20885"><img src="images/BWmainImage_hjk00885.jpg" alt="Grand Canyon National Park, Arizona. Boats near the mouth of the Little Colorado River. 1872. U.S. Geographical and Geological Survey of the Rocky Mountain Region (Powell Survey). Photos hjk00885 and hjk0885a form a stereoscopic view."></a>'
theCaptions[2] = 'Grand Canyon National Park, Arizona. Boats near the mouth of the Little Colorado River. 1872. U.S. Geographical and Geological Survey of the Rocky Mountain Region (Powell Survey). <br>ID. <a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Hillers,%20J.K.%20%20885" class="links">Hillers, J.K. 885</a><br>'

theImages[3] = '<a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Hillers,%20J.K.%201040"><img src="images/BWmainImage_hjk01040.jpg" alt="Major John Wesley Powell in Indian dress and Tau-ruv, a member of Paiute Indian Tribe. Photo taken in Uintah Valley, eastern slope of the Wasatch Mountains. Utah.n.d. Photo courtesy Smithsonian Institution, Bureau of American Ethnology)"></a>'
theCaptions[3] = 'Major John Wesley Powell in Indian dress and Tau-ruv, a member of Paiute Indian Tribe. Photo taken in Uintah Valley, eastern slope of the Wasatch Mountains. Utah.n.d. Photo courtesy Smithsonian Institution, Bureau of American Ethnology) <br>ID. <a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Hillers,%20J.K.%201040" class="links">Hillers, J.K. 1040</a><br>'

theImages[4] = '<a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Hansen,%20W.R.%20147"><img src="images/BWmainImage_hwr00147.jpg" alt="Paleontologist carefully chips rock matrix from a column of dinosaur vertebrae. These bones will be left in place for the visitor to see them just as they were deposited. Dinosaur National Monument. Uintah County, Utah. n.d."></a>'
theCaptions[4] = 'Paleontologist carefully chips rock matrix from a column of dinosaur vertebrae. These bones will be left in place for the visitor to see them just as they were deposited. Dinosaur National Monument. Uintah County, Utah. n.d. ID. <a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Hansen,%20W.R.%20147" class="links">Hansen, W.R. 147</a><br>'

theImages[5] = '<a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Jackson,%20W.H.%20%20282"><img src="images/BWmainImage_jwh00282.jpg" alt="Wyoming. Group of all the members of the Survey, made while in camp at Red Buttes at the junction of the North Platte and Sweetwater Rivers. 1870. U.S. Geological and Geographical Survey of the Territories (Hayden Survey)."></a>'
theCaptions[5] = 'Wyoming. Group of all the members of the Survey, made while in camp at Red Buttes at the junction of the North Platte and Sweetwater Rivers. 1870. U.S. Geological and Geographical Survey of the Territories (Hayden Survey). <br>ID. <a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Jackson,%20W.H.%20%20282" class="links">Jackson, W.H. 282</a><br>'

theImages[6] = '<a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Jackson,%20W.H.%20%20708"><img src="images/BWmainImage_jwh00708.jpg" alt="Main street in Cheyenne. Laramie County, Wyoming. 1869. (Stereoscopic view)"></a>'
theCaptions[6] = 'Main street in Cheyenne. Laramie County, Wyoming. 1869. (Stereoscopic view). ID. <a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Jackson,%20W.H.%20%20708" class="links">Jackson, W.H. 708</a><br>'

theImages[7] = '<a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Jackson,%20W.%20H.%20%200303"><img src="images/BWmainImage_jwh303v3.jpg" alt="The USGS en-route with pack train. Gilbert Doane in the lead. William Henry Jackson, photographer. (Yellowstone National Park.) U.S. Geological and Geographical Survey of the Territories, Yellowstone Series, 1871, Vol. III. (Hayden Survey)"></a>'
theCaptions[7] = 'The USGS en-route with pack train. Gilbert Doane in the lead. William Henry Jackson, photographer. (Yellowstone National Park.) U.S. Geological and Geographical Survey of the Territories, Yellowstone Series, 1871, Vol. III. (Hayden Survey) <br>ID. <a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Jackson,%20W.%20H.%20%200303" class="links">Jackson, W. H. 0303</a><br>'

theImages[8] = '<a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20King,%20%2096"><img src="images/BWmainImage_kingp096.jpg" alt="Clarence King in camp near Salt Lake City, Utah. Photo by T.H. O&acute;Sullivan, October 1868.U.S. Geological Exploration of the Fortieth Parallel (King Survey)."></a>'
theCaptions[8] = 'Clarence King in camp near Salt Lake City, Utah. Photo by T.H. O&acute;Sullivan, October 1868. U.S. Geological Exploration of the Fortieth Parallel (King Survey). ID. <a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20King,%20%2096" class="links">King, 96</a><br>'

theImages[9] = '<a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Lohman,%20S.W.%20685"><img src="images/BWmainImage_lsw00685.jpg" alt="Canyonlands National Park, Utah. Frank Masland inspecting petroglyphs in the lower part of the south fork of Horse Canyon in The Maze. Photo by U.S. National Park Service, May 1962."></a>'
theCaptions[9] = 'Canyonlands National Park, Utah. Frank Masland inspecting petroglyphs in the lower part of the south fork of Horse Canyon in The Maze. Photo by U.S. National Park Service, May 1962. <br>ID. <a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Lohman,%20S.W.%20685" class="links">Lohman, S.W. 685</a><br>'

theImages[10] = '<a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Lee,%20W.T.%201819"><img src="images/BWmainImage_lwt01819.jpg" alt="Fountain arkose in Roxbury Park, southwest of Denver; because of irregularity in constitution and hardness the upturned beds are here eroded into a variety of picturesque monuments. Douglas County, Colorado. 1922. Plate 7-A in U.S. Geological Survey. Professional paper 149. 1927."></a>'
theCaptions[10] = 'Fountain arkose in Roxbury Park, southwest of Denver; because of irregularity in constitution and hardness the upturned beds are here eroded into a variety of picturesque monuments. Douglas County, Colorado. 1922. Plate 7-A in U.S. Geological Survey. <a href="http://pubs.er.usgs.gov/usgspubs/index.jsp?jboEventVo=PubResultView&jboEvent=Search&view=adv&pxfield_series=PP&pxfield_rpt_year=&pxfield_rpt_seq=149&pxorderby=0&performSearch=Search+Now" class="links">Professional Paper 149</a>. 1927. <br>ID. <a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Lee,%20W.T.%201819" class="links">Lee, W.T. 1819</a><br>'

theImages[11] = '<a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Lee,%20W.T.%202478"><img src="images/BWmainImage_lwt02478.jpg" alt="Carlsbad Caverns National Park, New Mexico. A partition of onyx. A wall in the chambers known as Shinav&acute;s Wigwam (from Shinav, a mythical deity of the Navajo Indians). The stalactites have grown together laterally into a solid curtain-like mass. 1923. Plate 23-B, U.S. Geological Survey Bulletin 760."></a>'
theCaptions[11] = 'Carlsbad Caverns National Park, New Mexico. A partition of onyx. A wall in the chambers known as Shinav&acute;s Wigwam (from Shinav, a mythical deity of the Navajo Indians). The stalactites have grown together laterally into a solid curtain-like mass. 1923. Plate 23-B, U.S. Geological Survey <br><a href="http://pubs.er.usgs.gov/usgspubs/index.jsp?jboEventVo=PubResultView&jboEvent=Search&view=adv&pxfield_series=B&pxfield_rpt_year=&pxfield_rpt_seq=760&pxorderby=0&performSearch=Search+Now" class="links">Bulletin 760<a>. ID. <a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Lee,%20W.T.%202478" class="links">Lee, W.T. 2478</a><br>'

theImages[12] = '<a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Mount%20St.%20Helens%20-%2029"><img src="images/BWmainImage_msh00029.jpg" alt="Aerial view of volcano no in eruption with its violence in contrast with the quiet countryside in the foreground. Photo 80S3 203 by Austin Post. Skamania County, Washington. May 18, 1980."></a>'
theCaptions[12] = 'Aerial view of volcano no in eruption with its violence in contrast with the quiet countryside in the foreground. Photo 80S3 203 by Austin Post. Skamania County, Washington. May 18, 1980. <br>ID. <a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Mount%20St.%20Helens%20-%2029" class="links">Mount St. Helens - 29</a><br>'

theImages[13] = '<a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Portraits%20Collection%20%20264"><img src="images/BWmainImage_port0264.jpg" alt="President Franklin D. Roosevelt shaking hands with Wiley Post. circa 1932-1934."></a>'
theCaptions[13] = 'President Franklin D. Roosevelt shaking hands with Wiley Post. circa 1932-1934. <br>ID. <a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Portraits%20Collection%20%20264" class="links">Portraits Collection 264</a>'

theImages[14] = '<a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Stearns,%20H.T.%20693"><img src="images/BWmainImage_sht00693.jpg" alt="St. Francis Dam Flood March 12-13, 1928. Flood-twisted railroad track between Castic Junction and Piru, California. March 18, 1928."></a>'
theCaptions[14] = 'St. Francis Dam Flood March 12-13, 1928. Flood-twisted railroad track between Castic Junction and Piru, California. March 18, 1928. <br>ID. <a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Stearns,%20H.T.%20693" class="links">Stearns, H.T. 693</a><br>'

theImages[15] = '<a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Stearns,%20H.T.%20699"><img src="images/BWmainImage_sht00699.jpg" alt="St. Francis Dam Flood March 12-13, 1928. Santa Paula, California, houses piled against each other after the flood. Clean up crews at work. March 18, 1928."></a>'
theCaptions[15] = 'St. Francis Dam Flood March 12-13, 1928. Santa Paula, California, houses piled against each other after the flood. Clean up crews at work. March 18, 1928. ID. <a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Stearns,%20H.T.%20699" class="links">Stearns, H.T. 699</a><br>'

theImages[16] = '<a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Stephenson,%20L.W.%201346"><img src="images/BWmainImage_slw01346.jpg" alt="Wright Brothers National Memorial, North Carolina. Granite boulder marking the site of the first successful flight of a motor-driven airplane made by Orville Wright on December 17, 1903, near Kill Devil Hills. September 7, 1929."></a>'
theCaptions[16] = 'Wright Brothers National Memorial, North Carolina. Granite boulder marking the site of the first successful flight of a motor-driven airplane made by Orville Wright on December 17, 1903, near Kill Devil Hills. September 7, 1929. <br>ID. <a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Stephenson,%20L.W.%201346" class="links">Stephenson, L.W. 1346</a><br>'

theImages[17] = '<a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Staatz,%20M.H.%20281"><img src="images/BWmainImage_smh00281.jpg" alt="North Cascades National Park, Washington. Well-jointed quartz monzonite exposed on the north side of the peak northwest of Pocket Lake, on the west side of Ensawkwatch Creek. Circa 1967. Figure 13, U.S. Geological Survey Bulletin 1359."></a>'
theCaptions[17] = 'North Cascades National Park, Washington. Well-jointed quartz monzonite exposed on the north side of the peak northwest of Pocket Lake, on the west side of Ensawkwatch Creek. Circa 1967. Figure 13, U.S. Geological Survey <a href="http://pubs.er.usgs.gov/usgspubs/index.jsp?jboEventVo=PubResultView&jboEvent=Search&view=adv&pxfield_series=B&pxfield_rpt_year=&pxfield_rpt_seq=1359&pxorderby=0&performSearch=Search+Now" class="links">Bulletin 1359</a>. <br>ID. <a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Staatz,%20M.H.%20281" class="links">Staatz, M.H. 281</a><br>'

theImages[18] = '<a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Topography%20A%20696"><img src="images/BWmainImage_topa0696.jpg" alt="Rocky Mountain National Park, Colorado. Longs Peak. Photo by G.E. Mitchell, (Director&acute;s secretary), 1914."></a>'
theCaptions[18] = 'Rocky Mountain National Park, Colorado. Longs Peak. Photo by G.E. Mitchell, (Director&acute;s secretary), 1914. ID. <a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Topography%20A%20696" class="links">Topography A 696</a><br>'

theImages[19] = '<a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Turner,%20R.M.%2088"><img src="images/BWmainImage_trm00088.jpg" alt="Grand Canyon National Park, Arizona. A dense community of saltcedar, arrowweed, and seep willow has become established along the shore on both sides of the Colorado River. The fan on the right is more heavily overgrown by plants than in 1923, except for the formerly stabilized high terrace which now seems to be covered by a sand deposit. September 29, 1976. Figure 69-B, U.S. Geological Survey Professional paper 1132."></a>'
theCaptions[19] = 'Grand Canyon National Park, Arizona. A dense community of saltcedar, arrowweed, and seep willow has become established along the shore on both sides of the Colorado River. The fan on the right is more heavily overgrown by plants than in 1923, except for the formerly stabilized high terrace which now seems to be covered by a sand deposit. September 29, 1976. Figure 69-B, U.S. Geological Survey <a href="http://pubs.er.usgs.gov/usgspubs/index.jsp?jboEventVo=PubResultView&jboEvent=Search&view=adv&pxfield_series=PP&pxfield_rpt_year=&pxfield_rpt_seq=1132&pxorderby=0&performSearch=Search+Now" class="links">Professional Paper 1132</a>. <br>ID. <a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Turner,%20R.M.%2088" class="links">Turner, R.M. 88</a>'

theImages[20] = '<a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Veatch,%20F.M.%2048"><img src="images/BWmainImage_vfm00048.jpg" alt="Mount Rainier National Park, Washington. The Nisqually valley below Nisqually Glacier, as seen from station 3. Aggradation on the flood plain, caused by the outburst flood of October 25, 1955, is evidenced by altered topography and dead trees. A new bridge was constructed high above the flood-affected channels. August 31, 1965. Figure 38, U.S. Geological Survey Professional paper 631."></a>'
theCaptions[20] = 'Mount Rainier National Park, Washington. The Nisqually valley below Nisqually Glacier, as seen from station 3. Aggradation on the flood plain, caused by the outburst flood of October 25, 1955, is evidenced by altered topography and dead trees. A new bridge was constructed high above the flood-affected channels. August 31, 1965. Figure 38, U.S. Geological Survey <a href="http://pubs.er.usgs.gov/usgspubs/index.jsp?jboEventVo=PubResultView&jboEvent=Search&view=adv&pxfield_series=PP&pxfield_rpt_year=&pxfield_rpt_seq=631&pxorderby=0&performSearch=Search+Now" class="links">Professional Paper 631</a>. <br>ID. <a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Veatch,%20F.M.%2048" class="links">Veatch, F.M. 48</a>'

theImages[21] = '<a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Vaughan,%20T.W.%201336"><img src="images/BWmainImage_vtw01336.jpg" alt="Cape Cod National Seashore, Massachusetts. Northeast side of the marsh west of the breakwater at the southwest end of Provincetown. August 30, 1916."></a>'
theCaptions[21] = 'Cape Cod National Seashore, Massachusetts. Northeast side of the marsh west of the breakwater at the southwest end of Provincetown. August 30, 1916. ID. <a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Vaughan,%20T.W.%201336" class="links">Vaughan, T.W. 1336</a><br>'

theImages[22] = '<a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Walcott,%20C.D.%20564"><img src="images/BWmainImage_wcd00564.jpg" alt="Yellowstone National Park. Elk, with horns in the velvet. Camp near Mammoth Hot Springs. Wyoming. 1898."></a>'
theCaptions[22] = 'Yellowstone National Park. Elk, with horns in the velvet. Camp near Mammoth Hot Springs. Wyoming. 1898. ID. <a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Walcott,%20C.D.%20564" class="links">Walcott, C.D. 564</a><br>'

theImages[23] = '<a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Walcott,%20C.D.%20475g"><img src="images/BWmainImage_wcd0475g.jpg" alt="Yellowstone National Park. Bear&acute;s in vicinity of garbage dump near Fountain Hotel, Fountain Geyser Basin. Sheridan County, Wyoming. August 1897."></a>'
theCaptions[23] = 'Yellowstone National Park. Bear&acute;s in vicinity of garbage dump near Fountain Hotel, Fountain Geyser Basin. Sheridan County, Wyoming. August 1897. <br>ID. <a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Walcott,%20C.D.%20475g" class="links">Walcott, C.D. 475g</a><br>'

theImages[24] = '<a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Walcott,%20C.D.%20478b"><img src="images/BWmainImage_wcd0478b.jpg" alt="Yellowstone National Park, Wyoming. Buffalo on Frank Island in Yellowstone Lake. August 1897."></a>'
theCaptions[24] = 'Yellowstone National Park, Wyoming. Buffalo on Frank Island in Yellowstone Lake. August 1897. ID. <a href="http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Walcott,%20C.D.%20478b" class="links">Walcott, C.D. 478b</a><br>'

// ======================================
// do not change anything below this line
// ======================================

var j = 0
var p = theImages.length;

var preBuffer = new Array()
for (i = 0; i < p; i++){
   preBuffer[i] = new Image()
   preBuffer[i].src = theImages[i]
}

var whichImage = Math.round(Math.random()*(p-1));
function showImage(){
document.write(theImages[whichImage]);
}
function showCaption(){
document.write(theCaptions[whichImage]);
}
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