function newImage(arg) {
    if (document.images) {
        rslt = new Image();
        rslt.src = arg;
        return rslt;
    }
}

function changeImages() {
    if (document.images && (preloadFlag == true)) {
        for (var i=0; i<arguments.length; i=i+2) {        
			document.getElementById(changeImages.arguments[i]).src = changeImages.arguments[i+1];
        }
    }
}
var btnhomeon = 'layout/basic/images/home_on.gif';
var btnhomeoff = 'layout/basic/images/home_off.gif';
var btnmenuon = 'layout/basic/images/menu_on.gif';
var btnmenuoff = 'layout/basic/images/menu_off.gif';
var btngalleryon = 'layout/basic/images/gallery_on.gif';
var btngalleryoff = 'layout/basic/images/gallery_off.gif';
var btnserviceson = 'layout/basic/images/services_on.gif';
var btnservicesoff = 'layout/basic/images/services_off.gif';
var btncontacton = 'layout/basic/images/contact_on.gif';
var btncontactoff = 'layout/basic/images/contact_off.gif';


var preloadFlag = false;
function preloadImages() {
    if (document.images) {
        menu_on = newImage("layout/basic/images/menu_on.gif");
        home_on = newImage("layout/basic/images/home_on.gif");
        gallery_on = newImage("layout/basic/images/gallery_on.gif");
        services_on = newImage("layout/basic/images/services_on.gif");
        contact_on = newImage("layout/basic/images/contact_on.gif");
        preloadFlag = true;
    }
}
function init() {
preloadImages();
}