$(document).ready(function () {
     
    $('#nav li').hoverIntent(
        function () {
            //show its submenu
            $('ul', this).slideDown();
 
        },
        function () {
            //hide its submenu
            $('ul', this).hide();        
        }
    );
	$("#nav_sub_1").hover(function () {
		$('#nav_aboutUs_marker').addClass("over_nav_aboutUs");
		},function () {
			$('#nav_aboutUs_marker').removeClass("over_nav_aboutUs");
		}
	);
	$("#nav_sub_2").hover(function () {
		$('#nav_productsServices_marker').addClass("over_nav_productsServices");
		},function () {
			$('#nav_productsServices_marker').removeClass("over_nav_productsServices");
		}
	);
});