function initPnav() {
	var obj = byId('pnav');
	var list = byTag(obj, 'li');
	for (var i=0; i<list.length; i++) {
		(function() {
			var p = i;
			addEvent(list[i], 'mouseover', function() {
				obj.style.backgroundPosition = 170 * p + "px 0"
			});
		})();
	}
}
function initJoinMain() {
	
	var mainStr = byId("alert_main").innerHTML;
	byId("alert_main").parentNode.removeChild(byId("alert_main"));
		
	var objName = "join_main";
	var objList = byId(objName).getElementsByTagName("LI");
	var len = objList.length;
	var offset = 41;
	
	for (var i=0; i<len; i++) {
		var alink = objList[i].getElementsByTagName("A")[0];
		var btn = objList[i].getElementsByTagName("INPUT");
		btn = btn[btn.length-1];
		btn.style.cursor = "pointer";
		var jmId = alink.id;
		btn.onclick = function() {
			new rolinAlertWindow(mainStr);
		}
		
		if (i%2 == 1) {
			
			var tmpp = Elem.next(Elem.first(objList[i]))
			var oldp = Elem.next(Elem.first(objList[i-1]))
			var nh = tmpp.offsetHeight;
			var oh = oldp.offsetHeight;
			if (nh < oh) {
				tmpp.style.height = (oh - offset) + "px";
			} 
			if (nh > oh) {
				oldp.style.height = (nh - offset) + "px";
			}
		}
	}
}