var timeout         = 500;
		var closetimer		= 0;
		var ddmenuparent      = 0;
	
		function jsddm_open()
		{	jsddm_canceltimer();
			jsddm_close();
			ddmenuparent = $(this).attr('class', 'selected');
			ddmenuparent.find('ul').eq(0).css('visibility', 'visible');}
	
		function jsddm_close()
		{	if(ddmenuparent) {
				ddmenuparent.find('ul').eq(0).css('visibility', 'hidden');
				ddmenuparent.removeAttr('class');
			}
		}
	
		function jsddm_timer()
		{	closetimer = window.setTimeout(jsddm_close, timeout);}
	
		function jsddm_canceltimer()
		{	if(closetimer)
			{	window.clearTimeout(closetimer);
				closetimer = null;}}
	
		$(document).ready(function()
		{	$('#main_menu > li').bind('mouseover', jsddm_open);
			$('#main_menu > li').bind('mouseout',  jsddm_timer);});
	
		document.onclick = jsddm_close;