if (document.images)
{
    var imgPricingOn = LoadImage('images/pricing_on.gif');
    var imgPricingOff = LoadImage('images/pricing_off.gif');
    var imgOrderOn = LoadImage('images/order_on.gif');
    var imgOrderOff = LoadImage('images/order_off.gif');
    var imgContactOn = LoadImage('images/contact_on.gif');
    var imgContactOff = LoadImage('images/contact_off.gif');
    var imgSubmitOn = LoadImage('images/submit_on.gif');
    var imgSubmitOff = LoadImage('images/submit_off.gif');
}

function LoadImage(imagePath)
{
    var image = new Image();
    image.src = imagePath;
    return image;
}

function ChangeImage(imageId, newImagePath)
{
    var image = document.getElementById(imageId);
    image.src = newImagePath;
}