Event.observe ( window, "load", function() {
    $$('.nav_menu_root').each(function(item) {
        Event.observe(item, "mouseover", function() {
            
            if (item.className.match( /(^|\s)navBlue(\s|$)/ )) {
                item.style.color = "#00A";
            } else if (item.className.match( /(^|\s)navRed(\s|$)/ )) {
                item.style.color = "#00A";
            } else if (item.className.match( /(^|\s)navGreen(\s|$)/ )) {
                item.style.color = "#00A";
            } else if (item.className.match( /(^|\s)navPurple(\s|$)/ )) {
                item.style.backgroundImage = "url('/images/menu_bg_purple.jpg')";
            } else if (item.className.match( /(^|\s)navOrange(\s|$)/ )) {
                item.style.backgroundImage = "url('/images/menu_bg_orange.jpg')";
            } else if (item.className.match( /(^|\s)navGreenLight(\s|$)/ )) {
                item.style.backgroundImage = "url('/images/menu_bg_GreenLight.jpg')";				
            } else {
                item.style.backgroundImage = "url('/images/menu_bg_default.jpg')";
            }
            
            $A(item.childNodes).each(function(node) {
                if (node.className == "nav_menu_subitems") {
                    node.style.display = "block";
                }
            });            
        });
        
        Event.observe(item, "mouseout", function() {
            item.style.backgroundImage = "";
            
            $A(item.childNodes).each(function(node) {
                if (node.className == "nav_menu_subitems") {
                    node.style.display = "none";
                }
            });    
        });        
    });
});