if (document.images) {

menu4On = new Image();
menu4On.src = "images/menu_home_on.gif";
menu4Off = new Image();
menu4Off.src = "images/menu_home.gif";
            
menu1On = new Image();
menu1On.src = "images/menu_about_on.gif";
menu1Off = new Image();
menu1Off.src = "images/menu_about.gif";
            
menu2On = new Image();
menu2On.src = "images/menu_services_on.gif";
menu2Off = new Image();
menu2Off.src = "images/menu_services.gif";
            
menu5On = new Image();
menu5On.src = "images/menu_events_on.gif";
menu5Off = new Image();
menu5Off.src = "images/menu_events.gif";
            
menu6On = new Image();
menu6On.src = "images/menu_tips_on.gif";
menu6Off = new Image();
menu6Off.src = "images/menu_tips.gif";
            
menu7On = new Image();
menu7On.src = "images/menu_links_on.gif";
menu7Off = new Image();
menu7Off.src = "images/menu_links.gif";

menu3On = new Image();
menu3On.src = "images/menu_contact_on.gif";
menu3Off = new Image();
menu3Off.src = "images/menu_contact.gif";

}

function imgOn(imgName) {
        if (document.images) {
            eval('document.'+imgName+'.src = '+imgName+'On.src');
        }
}
function imgOff(imgName) {
        if (document.images) {
            eval('document.'+imgName+'.src = '+imgName+'Off.src');
        }
}