window.onload = function(){
	var menuNode = document.getElementById("pb1");
	var menuLinks = menuNode.getElementsByTagName("img");
	var menuNode2 = document.getElementById("pb2");
	var menuLinks2 = menuNode2.getElementsByTagName("img");

		for(i=0;i<menuLinks.length;i++){
			menuLinks[i].onmouseover = function(){
			this.src= this.src.split("_off.jpg")[0]+"_on.jpg";
			}
			menuLinks[i].onmouseout = function(){
			this.src = this.src.split("_on.jpg")[0]+"_off.jpg";
			}
		}

		for(i=0;i<menuLinks2.length;i++){
			menuLinks2[i].onmouseover = function(){
			this.src= this.src.split("_off.jpg")[0]+"_on.jpg";
			}
			menuLinks2[i].onmouseout = function(){
			this.src = this.src.split("_on.jpg")[0]+"_off.jpg";
			}
		}

}