function random_imglink(){
var myimages=new Array()
myimages[1]="/images/marble1.jpg"
myimages[2]="/images/marble2.jpg"
myimages[3]="/images/marble3.jpg"
myimages[4]="/images/marble4.jpg"


//specify corresponding links below
var ry=Math.floor(Math.random()*myimages.length)
if (ry==0)
ry=1
document.write('<img src="'+myimages[ry]+'" border=0>')
}