function GNBChange(obj) {
	var GNBObj = document.getElementById("GNB");
	var GNB_li = GNBObj.getElementsByTagName("li");
	var GNB_Temp = "";

	for (var i=0; i<GNB_li.length; i++) {
		GNB_Temp = GNB_li[i].className;
		if (GNB_Temp.indexOf(obj.className)>=0) {
			if (GNB_Temp.indexOf(" on")<0) {
				GNB_li[i].className = GNB_Temp + " on";
			}
		} else {
			GNB_li[i].className = GNB_Temp.replace(" on","");
		}
	}
}

function GNBClear() {
	var GNBObj = document.getElementById("GNB");
	var GNB_li = GNBObj.getElementsByTagName("li");

	for (var i=0; i<GNB_li.length; i++) {
		GNB_li[i].className = GNB_li[i].className.replace(" on","");
	}
}