if (document.images) 
    {   var delivery = new Image()
        delivery.src = "images/center_02.jpg"
        var deliverys = new Image()
        deliverys.src = "images_color/center_color_02.jpg"
 
        var about = new Image()
        about.src = "images/center_03.jpg"
        var abouts = new Image()
        abouts.src = "images_color/center_color_03.jpg"

        var tube = new Image()
        tube.src = "images/center_04.jpg"
        var tubes = new Image()
        tubes.src = "images_color/center_color_04.jpg"

        var sale = new Image()
        sale.src = "images/center_05.jpg"
        var sales = new Image()
        sales.src = "images_color/center_color_05.jpg"

        var sal = new Image()
        sal.src = "images/center_10.gif"
        var sals = new Image()
        sals.src = "images_color/center_color_10.gif"

        var link = new Image()
        link.src = "images/center_06.gif"
        var links = new Image()
        links.src = "images_color/center_color_06.gif"

        var warranty = new Image()
        warranty.src = "images1/center1_06.gif"
        var warrantys = new Image()
        warrantys.src = "images2/center2_06.gif"
        
        var payment = new Image()
        payment.src = "images/center_09.gif"
        var payments = new Image()
        payments.src = "images_color/center_color_09.gif"

        var war=new Image()
        war.src="images2/center2_07.gif"   
       
     }
function go(imgName) 
    {   if (document.images) 
        document[imgName].src = eval(imgName + 's.src')
     }
function back(imgName) 
    {   if (document.images)
        document[imgName].src = eval(imgName + '.src')
     }
function w ()
{
document.images['payment'].src = war.src;
}
function wb()
{
document.images['payment'].src = payment.src;
}