var onSubmenu = false;
var alreadyOpen = false;

$(document).ready(function() {
	$('#menu-competence').hover(
		function () {
			if (!alreadyOpen) {
				$('#submenu-competence').slideDown('fast', function() { alreadyOpen = true; });
			}
		},
		function () {
			if (alreadyOpen && !onSubmenu) {
				$('#submenu-competence').slideUp('fast', function() { alreadyOpen = false; });
			}
		}
	);

	$('#submenu-competence').hover(
		function () { onSubmenu = true; },
		function () { onSubmenu = false; }
	);
});