var theImagesE = new Array()

theImagesE[0] = 'thumbs/E1.gif'
theImagesE[1] = 'thumbs/E2.gif'
theImagesE[2] = 'thumbs/E3.gif'
theImagesE[3] = 'thumbs/E4.gif'
theImagesE[4] = 'thumbs/E5.gif'
theImagesE[5] = 'thumbs/E6.gif'
theImagesE[6] = 'thumbs/E7.gif'

var j = 0
var p = theImagesE.length;
var preBuffer = new Array()
for (i = 0; i < p; i++){
   preBuffer[i] = new Image()
   preBuffer[i].src = theImagesE[i]
}
var whichImageE = Math.round(Math.random()*(p-1));
function showImageE(){
document.write('<img src="'+theImagesE[whichImageE]+'">');
}