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<changeImages.arguments.length; i+=2) {
            document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
        }
    }
}

var preloadFlag = false;
function preloadImages() {
    if (document.images) {
        thecompany_over = newImage("/images/thecompany-over.jpg");
        keypersonnel_over = newImage("/images/keypersonnel-over.jpg");
        completeprojects_over = newImage("/images/completeprojects-over.jpg");
        previousprojects_over = newImage("/images/previousprojects-over.jpg");
        references_over = newImage("/images/references-over.jpg");
        equipment_over = newImage("/images/equipment-over.jpg");
        contact_over = newImage("/images/contact-over.jpg");
        home_over = newImage("/images/home-over.jpg");
        preloadFlag = true;
    }
}