var theImages = new Array() 
theImages[0] = 'http://server.df60reseller.com/~gbenergy/dynamic/random2/nia.gif'
theImages[1] = 'http://server.df60reseller.com/~gbenergy/dynamic/random2/ravenheat.gif'
theImages[2] = 'http://server.df60reseller.com/~gbenergy/dynamic/random2/schuco.gif'
theImages[3] = 'http://server.df60reseller.com/~gbenergy/dynamic/random2/spirotech.gif'
theImages[4] = 'http://server.df60reseller.com/~gbenergy/dynamic/random2/tisun.gif'
theImages[5] = 'http://server.df60reseller.com/~gbenergy/dynamic/random2/vaillant.gif'
theImages[6] = 'http://server.df60reseller.com/~gbenergy/dynamic/random2/warmfront.gif'
theImages[7] = 'http://server.df60reseller.com/~gbenergy/dynamic/random2/worcester.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]+'">');
}