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) {
        HomeOn = newImage("images/button_hover_01.jpg");
        HomeClick = newImage("images/button_hover_01.jpg");
        WhatWeDoOn = newImage("images/button_hover_02.jpg");
        WhatWeDoClick = newImage("images/button_hover_02.jpg");
        WhoWeAreOn = newImage("images/button_hover_03.jpg");
        WhoWeAreClick = newImage("images/button_hover_03.jpg");
        PastProjectsOn = newImage("images/button_hover_04.jpg");
        PastProjectsClick = newImage("images/button_hover_04.jpg");
        ReferencesOn = newImage("images/button_hover_05.jpg");
        ReferencesClick = newImage("images/button_hover_05.jpg");
        ContactUsOn = newImage("images/button_hover_06.jpg");
        ContactUsClick = newImage("images/button_hover_06.jpg");
        EmploymentOn = newImage("images/button_hover_07.jpg");
        EmploymentClick = newImage("images/button_hover_07.jpg");

        preloadFlag = true;
    }
}