function showImage(){

var theImages = new Array() 

theImages[0] = 'Cairn_Peak_550px_wide.jpg'
theImages[1] = 'West_Bowl_550px_wide.jpg'
theImages[2] = 'sunrise_550px_wide.jpg'

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));

document.write('<img src="/images/'+theImages[whichImage]+'" style="width:425px;float:none;margin:-10px 0px 10px 0px;">');
}