var delayID = null;

$(document).ready(function(){
    $('#nav_top_services').hover(function(){
		if(delayID != null){
			clearTimeout(delayID);	
			delayID = null;
		}
	}, function(){
		delayID = setTimeout("togglePanel()", 1500);
    });	
});

function togglePanel() {
	$('#nav_top_services').slideToggle('fast', function(){
		clearTimeout(delayID);
		delayID = null;
	});
}