var cl = 0;
var timer = 500;

function show_childs(obj)
{
	cancel();
	hide_childs();
	var ul = obj.parentNode.getElementsByTagName('UL');
	if (ul.length)
		ul[0].style.display='';
}
function getElementsByClass(searchClass,node,tag) {
	var classElements = new Array();
	if ( node == null )
		node = document;
	if ( tag == null )
		tag = '*';
	var els = node.getElementsByTagName(tag);
	var elsLen = els.length;
	var pattern = new RegExp('(^|\\\\s)'+searchClass+'(\\\\s|$)');
	for (i = 0, j = 0; i < elsLen; i++) {
		if ( pattern.test(els[i].className) ) {
			classElements[j] = els[i];
			j++;
		}
	}
	return classElements;
}
document.onclick = hide_childs;
function hide_childs(){
	var els = getElementsByClass('menu_childs');
	if (els.length)
	for (i=0;els[i];i++)
		els[i].style.display='none';
}

function cancelclear()
{
	cl = setTimeout(hide_childs, timer);
}

function cancel()
{
    if (cl) {clearTimeout(cl);
    cl = null;
    }

}