startHighlight = function(){
	if (document.all && document.getElementById){  
			navRoot = document.getElementById("pictureThumbnails");
			tbody = navRoot.childNodes[0];
		for (i = 0; i < tbody.childNodes.length; i++){
			node = tbody.childNodes[i];
				if (node.nodeName == "TR"){
				
				node.onmouseover=function(){
					this.className = "over";
					}
				node.onmouseout=function(){
					this.className = this.className.replace("over", "");
					}
				}
		}
	}
}
window.onload = startHighlight;