function navMOEffect(navItem) {
	if (!document.getElementById("nav")) return false;
	var navList = document.getElementById("nav");
	var navAList = navList.getElementsByTagName("a");
	var itemFlag=false;
	for (var i=0; i<navAList.length; i++) {
		var thisLink = navAList[i];
		if (thisLink==navItem) {
			thisLink.style.background="url(img/nav_bullet.gif) no-repeat bottom left";
			itemFlag=true;
		} else if (itemFlag==false) {
			thisLink.style.background="url(img/nav_bullet.gif) no-repeat top left";
		} else if (itemFlag==true) {
			thisLink.style.background="none";
		}
	}
}

function navMOOff() {
	if (!document.getElementById("nav")) return false;
	var navList = document.getElementById("nav");
	var navAList = navList.getElementsByTagName("a");
	for (var i=0; i<navAList.length; i++) {
		var thisLink = navAList[i];
		thisLink.style.background="none";
	}
}

function setNavMO() {
	if (!document.getElementById("nav")) return false;
	var navList = document.getElementById("nav");
	navList.onmouseout = function () {
		navMOOff();
	}
	var navAList = navList.getElementsByTagName("a");
	for (var i=0; i<navAList.length; i++) {
		var thisLink = navAList[i];
		thisLink.onmouseover = function () {
			navMOEffect(this);
		}
	}
}

addLoadEvent(setNavMO);