var timeout         = 500;
var closetimer		= 0;
var ddmenuitem      = 0;

function dropdown_open() {
	dropdown_canceltimer();
	dropdown_close();
	ddmenuitem = $(this).find('ul').eq(0).css('visibility', 'visible');
}

function dropdown_close() {	
	if (ddmenuitem) { 
		ddmenuitem.css('visibility', 'hidden');
	}
}

function dropdown_timer() {
	closetimer = window.setTimeout(dropdown_close, timeout);
}

function dropdown_canceltimer() {
	if (closetimer) {
		window.clearTimeout(closetimer);
		closetimer = null;
	}
}
function dropdown(selector) {
	$(document).ready(
					  function() {	
					  	$(selector).bind('mouseover', dropdown_open);
						$(selector).bind('mouseout',  dropdown_timer);
					});
	$(document).bind('click', dropdown_close);
}