var randomlinks=new Array()

randomlinks[0]="http://www.upco.com/cgi-bin/Upcol.storefront/4638bad1001d7d40ea6dc0a80aa50714/Product/View/638"
randomlinks[1]="http://www.valleyvet.com/ct_detail.html?pgguid=b541a4b0-eee2-46b8-a37b-93552fea7c26&ccd=IFA003"
randomlinks[3]="http://www.drugstore.com/templates/brand/default.asp?brand=38613&aid=337871"

function randomlink(){
window.open(randomlinks[Math.floor(Math.random()*randomlinks.length)])
}