if (document.images) {
    var home = new Image();
    home.src = "images/home0.gif";
    var home_on = new Image();
    home_on.src = "images/home1.gif";
    
    var aboutus = new Image();
    aboutus.src = "images/aboutus0.gif";
    var aboutus_on = new Image();
    aboutus_on.src = "images/aboutus1.gif";
    
    var products = new Image();
    products.src = "images/products0.gif";
    var products_on = new Image();
    products_on.src = "images/products1.gif";
    
    var widaq = new Image();
    widaq.src = "images/widaq0.gif";
    var widaq_on = new Image();
    widaq_on.src = "images/widaq1.gif";
    
    var support = new Image();
    support.src = "images/support0.gif";
    var support_on = new Image();
    support_on.src = "images/support1.gif";
    
    var order = new Image();
    order.src = "images/order0.gif";
    var order_on = new Image();
    order_on.src = "images/order1.gif";
}
      
function act(imgName) {
    if (document.images) {
    document[imgName].src = eval(imgName + "_on.src");
    }
}
      
function inact(imgName) {
    if (document.images) {
    document[imgName].src = eval(imgName + ".src");
    }
}