if (navigator.appVersion.indexOf("2.") != -1){
       check = false;
}

if ((navigator.appVersion.indexOf("3.") != -1) && (navigator.appName.indexOf("Explorer") != -1)){
     check = false;
} else {
     check = true;
}

about = new Image();
about.src = "images/about_off.gif";
abouton = new Image();
abouton.src = "images/about_on.gif";

contact = new Image();
contact.src = "images/contact_off.gif";
contacton = new Image();
contacton.src = "images/contact_on.gif";

cmain = new Image();
cmain.src = "images/cmain_off.gif";
cmainon = new Image();
cmainon.src = "images/cmain_on.gif";

cservice = new Image();
cservice.src = "images/cservice_off.gif";
cserviceon = new Image();
cserviceon.src = "images/cservice_on.gif";

cads = new Image();
cads.src = "images/cads_off.gif";
cadson = new Image();
cadson.src = "images/cads_on.gif";

carticles = new Image();
carticles.src = "images/carticles_off.gif";
carticleson = new Image();
carticleson.src = "images/carticles_on.gif";

corders = new Image();
corders.src = "images/corders_off.gif";
corderson = new Image();
corderson.src = "images/corders_on.gif";

clinks = new Image();
clinks.src = "images/clinks_off.gif";
clinkson = new Image();
clinkson.src = "images/clinks_on.gif";

function imageon(name)   {

        document[name].src = eval(name + "on.src");
}

function imageoff(name)  {

        document[name].src = eval(name + ".src"); 

}

function on(name)  {
        if (check == true){
                imageon(name);}
}
function off(name)  {
        if (check == true){
                imageoff(name);}
}