$(document).ready(function(){
	var timeoutId;
	$('#menu-about').mouseover(function(){
		$('#menu-extra').show();
		clearTimeout ( timeoutId );
	});
	$('#menu-about').mouseout(function(){
		timeoutId = setTimeout(function(){
			clearTimeout ( timeoutId );
			$('#menu-extra').hide();
		}, 500);
	});
	$('#menu-extra').mousemove(function(){
		clearTimeout ( timeoutId );
	});
	$('#menu-extra').mouseleave(function(){
		timeoutId = setTimeout(function(){
			clearTimeout ( timeoutId );
			$('#menu-extra').hide();
		}, 500);
	});
});