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

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

function dropdown_close()
{  
	//if(ddmenuitem) ddmenuitem.css('visibility', 'hidden');
	if(ddmenuitem) ddmenuitem.css('display', 'none');
}

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

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


function dropdown_create(menu_ul)
{
	$(menu_ul+' > li').bind('mouseover', dropdown_open)
   	$(menu_ul+' > li').bind('mouseout',  dropdown_timer)
}


document.onclick = dropdown_close;