menuHover();

function menuHover() {
	var imgNode = document.getElementById("mainMenu").getElementsByTagName("IMG");
	for (var f = 0; f < imgNode.length; f++) {
		imgNode[f].onmouseover = function() {this.src = String(this.src).replace("off","on");}
		imgNode[f].onmouseout = function() {this.src = String(this.src).replace("on","off");}
	}
}