var theImages = new Array() 

theImages[0] = 'images/hero_image_test/albany.gif'
theImages[1] = 'images/hero_image_test/bear-creek.gif'
theImages[2] = 'images/hero_image_test/bridge-construction.gif'
theImages[3] = 'images/hero_image_test/bridge-lights.gif'
theImages[4] = 'images/hero_image_test/broadway-bridge.gif'
theImages[5] = 'images/hero_image_test/casino.gif'
theImages[6] = 'images/hero_image_test/depot.gif'
theImages[7] = 'images/hero_image_test/laserscan1.gif'
theImages[8] = 'images/hero_image_test/playfield.gif'
theImages[9] = 'images/hero_image_test/raingarden.gif'
theImages[10] = 'images/hero_image_test/sunset.gif'
theImages[11] = 'images/hero_image_test/tumalo.gif'
theImages[12] = 'images/hero_image_test/windfarm.gif'
theImages[13] = 'images/hero_image_test/bridge-construction-2.gif'
theImages[14] = 'images/hero_image_test/laserscan2.gif'
theImages[15] = 'images/hero_image_test/n-torrey-bridge.gif'
theImages[16] = 'images/hero_image_test/sauvie.gif'
theImages[17] = 'images/hero_image_test/side-scan-sonar.gif'
theImages[18] = 'images/hero_image_test/sunset.gif'
theImages[19] = 'images/hero_image_test/williamson.gif'
theImages[20] = 'images/hero_image_test/solar-panels.gif'
theImages[21] = 'images/hero_image_test/silverfalls.gif'
theImages[22] = 'images/hero_image_test/walkway.gif'

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('<img src="'+theImages[whichImage]+'" width="811" height="238" border="0">');
}