var promotions=[
"show1.jpg","?categoryid=420",
"show2.jpg","?categoryid=428",
"show3.jpg","?categoryid=426",
"show4.jpg","?categoryid=422",
"show5.jpg","?categoryid=372",
"show6.jpg","?categoryid=436",
"show7.jpg","?categoryid=352"
]
function changeimg(){
  var img=document.getElementById("prodshow");
  var link=document.getElementById("prodlink");
	if(img==null||link==null)return;

	var ic=promotions.length/2;
	var i=Math.floor(Math.random()*ic);

	var s=img.src.split("\/");
	s=s.slice(0,-1);
	s.push(promotions[i*2]);
	img.src=s.join("\/");
	
	var t=link.href.split("\/");
	t=t.slice(0,-1);
	t.push(promotions[i*2+1]);
	link.href=t.join("\/");
}
changeimg();