function rolloverInit() {
	for (var i=0; i<document.images.length; i++) {
		if (document.images[i].parentNode.tagName == "A") {
			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 = "images/" + thisImage.id + "-on.gif";
    thisImage.onmouseover = rollOver;

    thisImage.parentNode.onblur = rollOutChild;
    thisImage.parentNode.onfocus = rollOverChild;
    thisImage.parentNode.childImg = thisImage;
}

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

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

function rollOverChild() {
    this.childImg.src = this.childImg.overImage.src;
}

function rollOutChild() {
    this.childImg.src = this.childImg.outImage.src;
}