if(document.images)
{
    nav = new Array();
    nav[01] = new Image();
    nav[01].src = "images/btn_order.gif";
    nav[02] = new Image();
    nav[02].src = "images/btn_order_ovr.gif";
    nav[03] = new Image();
    nav[03].src = "images/btn_checkout.gif";
    nav[04] = new Image();
    nav[04].src = "images/btn_checkout_ovr.gif";
    nav[05] = new Image();
    nav[05].src = "images/btn_clear.gif";
    nav[06] = new Image();
    nav[06].src = "images/btn_clear_ovr.gif";
    nav[07] = new Image();
    nav[07].src = "images/btn_delete.gif";
    nav[08] = new Image();
    nav[08].src = "images/btn_delete_ovr.gif";
    nav[09] = new Image();
    nav[09].src = "images/btn_shopping.gif";
    nav[10] = new Image();
    nav[10].src = "images/btn_shopping_ovr.gif";
    nav[11] = new Image();
    nav[11].src = "images/btn_continue.gif";
    nav[12] = new Image();
    nav[12].src = "images/btn_continue_ovr.gif";
    nav[13] = new Image();
    nav[13].src = "images/btn_back.gif";
    nav[14] = new Image();
    nav[14].src = "images/btn_back_ovr.gif";
    nav[15] = new Image();
    nav[15].src = "images/btn_submit.gif";
    nav[16] = new Image();
    nav[16].src = "images/btn_submit_ovr.gif";
/*    nav[17] = new Image();
    nav[17].src = "images/edit.gif";
    nav[18] = new Image();
    nav[18].src = "images/edit_ovr.gif";
    nav[19] = new Image();
    nav[19].src = "images/cancel.gif";
    nav[20] = new Image();
    nav[20].src = "images/cancel_ovr.gif";
    nav[21] = new Image();
    nav[21].src = "images/backtoresults.gif";
    nav[22] = new Image();
    nav[22].src = "images/backtoresults_ovr.gif";*/
}


function change_nav(from,to)
{
    if(document.images)
    {
        document.images[from].src = nav[to].src;
    }
}