var main_name = "";

document.onmouseover = onclickEvent;
function onclickEvent(e) {
	e = e || window.event;
	if(!e.target) {
		e.target = event.srcElement;
	}
	reg = /main/;
	if(reg.test(e.target.id)) {
	//	document.getElementById('test').innerHTML = (e.target.id);
		mainlist(e.target.id);
	} else {
		mainlist_close();
	}
	
}

function mainlist(id) {
	reg = /_0/;
	if(!reg.test(id)) {
		if(main_name!="") {
			document.getElementById(main_name).style.background = "";
			document.getElementById(main_name+'_0').style.display = "none";
			main_name = "";
		}
		
		main_name = id;
		document.getElementById(id).style.background = "url(/images/main2.png)";
		
		if(document.getElementById(id+'_0').innerHTML=="") {
			return "";
		}
		
		document.getElementById(id+'_0').style.display = "block";

	}
}

function mainlist_close() {
	if(main_name=="") {
		return "";
	}
	document.getElementById(main_name).style.background = "";
	document.getElementById(main_name+'_0').style.display = "none";
	main_name = "";
}