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

function mainmenu_open()
{	mainmenu_canceltimer();
	mainmenu_close();
	ddmenuitem = jQuery(this).find('ul').eq(0).css('visibility', 'visible');}

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

function mainmenu_timer()
{	closetimer = window.setTimeout(mainmenu_close, timeout);}

function mainmenu_canceltimer()
{	if(closetimer)
	{	window.clearTimeout(closetimer);
		closetimer = null;}}

jQuery(document).ready(function()
{	jQuery('#mainmenu > li').bind('mouseover', mainmenu_open);
	jQuery('#mainmenu > li').bind('mouseout',  mainmenu_timer);});

document.onclick = mainmenu_close;