if (document.images) {
  header_homeon = new Image();
    header_homeon.src = "/images/header_home_on.gif";
    header_homeoff = new Image();
    header_homeoff.src = "/images/header_home_off.gif";
	header_webhostingon = new Image();
    header_webhostingon.src = "/images/header_webhosting_on.gif";
    header_webhostingoff = new Image();
    header_webhostingoff.src = "/images/header_webhosting_off.gif";	
	header_thietkewebon = new Image();
    header_thietkewebon.src = "/images/header_thietkeweb_on.gif";
    header_thietkeweboff = new Image();
    header_thietkeweboff.src = "/images/header_thietkeweb_off.gif";
	header_tenmienon = new Image();
    header_tenmienon.src = "/images/header_domain_on.gif";
    header_tenmienoff = new Image();
    header_tenmienoff.src = "/images/header_domain_off.gif";
	header_mangdoanhnghiepon = new Image();
    header_mangdoanhnghiepon.src = "/images/header_mangdoanhnghiep_on.gif";
    header_mangdoanhnghiepoff = new Image();
 	header_mangdoanhnghiepoff.src = "/images/header_mangdoanhnghiep_off.gif";
	header_contacton = new Image();
    header_contacton.src = "/images/header_contact_on.gif";
    header_contactoff = new Image();
    header_contactoff.src = "/images/header_contact_off.gif";
		
	nav_mangdoanhnghiepon = new Image();
    nav_mangdoanhnghiepon.src = "/images/nav_mangdoanhnghiep_on.gif";
    nav_mangdoanhnghiepoff = new Image();
    nav_mangdoanhnghiepoff.src = "/images/nav_mangdoanhnghiep_off.gif";
	nav_dailyon = new Image();
    nav_dailyon.src = "/images/nav_dailyhostingserver_on.gif";
    nav_dailyoff = new Image();
    nav_dailyoff.src = "/images/nav_dailyhostingserver_off.gif";
	nav_tenmienon = new Image();
    nav_tenmienon.src = "/images/nav_tenmiendomain_on.gif";
    nav_tenmienoff = new Image();
    nav_tenmienoff.src = "/images/nav_tenmiendomain_off.gif";
	nav_luutruwebon = new Image();
    nav_luutruwebon.src = "/images/nav_luutruweb_on.gif";
    nav_luutruweboff = new Image();
 	nav_luutruweboff.src = "/images/nav_luutruweb_off.gif";
	nav_thuongmaidientuon = new Image();
    nav_thuongmaidientuon.src = "/images/nav_thuongmaidientu_on.gif";
    nav_thuongmaidientuoff = new Image();
    nav_thuongmaidientuoff.src = "/images/nav_thuongmaidientu_off.gif";
	nav_thietkewebon = new Image();
    nav_thietkewebon.src = "/images/nav_thietkeweb_on.gif";
    nav_thietkeweboff = new Image();
    nav_thietkeweboff.src = "/images/nav_thietkeweb_off.gif";
	nav_thanhtoanon = new Image();
    nav_thanhtoanon.src = "/images/nav_thanhtoan_on.gif";
    nav_thanhtoanoff = new Image();
    nav_thanhtoanoff.src = "/images/nav_thanhtoan_off.gif";
	nav_supporton = new Image();
    nav_supporton.src = "/images/nav_hotro_on.gif";
    nav_supportoff = new Image();
 		nav_supportoff.src = "/images/nav_hotro_off.gif";
	nav_trangchuon = new Image();
    nav_trangchuon.src = "/images/nav_trangchu_on.gif";
    nav_trangchuoff = new Image();
 		nav_trangchuoff.src = "/images/nav_trangchu_off.gif";
      
}

// Function to 'activate' images.
function imgOn(imgName) {
        if (document.images) {
            document[imgName].src = eval(imgName + "on.src");
           
           
        }
}



// Function to 'deactivate' images.
function imgOff(imgName) {
        if (document.images) {
            document[imgName].src = eval(imgName + "off.src");
            
          
        }
}