var menuId = document.getElementsByTagName("meta")["pageName"].content;

document.getElementById(menuId).src = "images/" + menuId + "_s.png"; 

var l = document.getElementsByTagName("img");
for (var i = 0; i <l.length; i++) {
	if (l[i].className == "menuItem") {
		l[i].onmouseover = swapImage;
		l[i].onmouseout = swapImage;
	}
}

function swapImage(e)
{
	var srcElement;
	if (window.event) {
		srcElement = window.event.srcElement;
		e = window.event;
	} else {
		srcElement = e.target;
	}		
    
	var srcId = srcElement.id;
	
	if ("IMG"!= srcElement.tagName.toUpperCase()) return;
	if (srcId == menuId) return;
	if (e.type == "mouseover") {
		srcElement.src = "images/" + srcId + "_o.png";
	}
	else if (e.type == "mouseout") {
		srcElement.src = "images/" + srcId + ".png";
	}
	return;
}