function get_random()
{

// random()*X) is the number of images
var ranNum= Math.floor(Math.random()*1);
return ranNum;
}
var whichImg=get_random();

function show_image() {

// Array(X) is the number of images
var img=new Array(1)
img[0]="mainBanner1.jpg";

document.write("<table background='homepageImages/Ur/134/images/");
document.write(img[whichImg]);
document.write("'>");
}