window.onload = rolloverInit;

function rolloverInit(){
    for (var i=0; i<document.images.length; i++){
    if (document.images[i].parentNode.tagName=="A" && document.images[i].id>"0" ){setupRollover(document.images[i]);}}}

    function setupRollover(thisImage){
    thisImage.outImage=new Image();
    thisImage.outImage.src=thisImage.src;
    thisImage.onmouseout=rollOut;

    thisImage.overImage=new Image();
    thisImage.overImage.src="../Icons/"+thisImage.id+"_up.jpg";
    thisImage.onmouseover=rollOver;
    }

    function rollOver(){
    this.src=this.overImage.src;
    }

    function rollOut(){
    this.src=this.outImage.src;
    }