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

function jsddm_open() {  
	jsddm_close();
	ddmenuitem = $(this).find('ul').css('visibility', 'visible');
}

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

$(document).ready(function() {  
	$('#categories > li').bind('mouseover', jsddm_open)
	$('#categories > li').bind('mouseout', jsddm_close)
});

document.onclick = jsddm_close;