function addNavLinkListeners() {
	if(document.getElementById("nav-main")) {
//		var navlinks = document.getElementsBySelector("#nav-main ul.main-nav-ul li a");
		var navlinks = document.getElementsBySelector("#nav-main ul.main-nav-ul li");
		if(navlinks) {
			for(var i=0; i<navlinks.length; i++) {
				YAHOO.util.Event.addListener(navlinks[i], "mouseover", swapImageOn, navlinks[i]);
				YAHOO.util.Event.addListener(navlinks[i], "mouseout", swapImageOff, navlinks[i]);
			}
		}
	}
}

function swapImageOn(e, self) {
	var subimg = self.getElementsByTagName('img');
	if(!subimg) return false;
	subimg = subimg[0];
	if(!subimg) return false;
	if(!subimg.getAttribute('hoverSrc')) return false; //bounce back if the current link
	if(!subimg.getAttribute('origSrc'))
		subimg.setAttribute('origSrc', subimg.src);
	subimg.src = subimg.getAttribute('hoverSrc');
}
function swapImageOff(e, self) {
	var subimg = self.getElementsByTagName('img');
	if(!subimg) return false;
	subimg = subimg[0];
	if(!subimg) return false;
	if(!subimg.getAttribute('hoverSrc')) return false; //bounce back if the current link
	subimg.src = subimg.getAttribute('origSrc');
}
YAHOO.util.Event.addListener(window, "load", addNavLinkListeners);