button_next_off = new Image();
        button_next_off.src = "images/davall_button_next_off.gif";
        button_next_on = new Image();
        button_next_on.src = "images/davall_button_next_on.gif";

        button_back_off = new Image();
        button_back_off.src = "images/davall_button_back_off.gif";
        button_back_on = new Image();
        button_back_on.src = "images/davall_button_back_on.gif";

        button_down_off = new Image();
        button_down_off.src = "images/davall_button_down_off.gif";
        button_down_on = new Image();
        button_down_on.src = "images/davall_button_down_on.gif";
        

        gearmanufacture_off = new Image();
        gearmanufacture_off.src = "images/davall_nav_gearmanufacture_off.gif"
        gearmanufacture_on = new Image();
        gearmanufacture_on.src = "images/davall_nav_gearmanufacture_on.gif";

        catalogueonline_off = new Image();
        catalogueonline_off.src = "images/davall_nav_catalogueonline_off.gif"
        catalogueonline_on = new Image();
        catalogueonline_on.src = "images/davall_nav_catalogueonline_on.gif";

        customgearboxes_off = new Image();
        customgearboxes_off.src = "images/davall_nav_customgearboxes_off.gif";
        customgearboxes_on = new Image();
        customgearboxes_on.src = "images/davall_nav_customgearboxes_on.gif";

        stocksales_off = new Image();
        stocksales_off.src = "images/davall_nav_stocksales_off.gif";
        stocksales_on = new Image();
        stocksales_on.src = "images/davall_nav_stocksales_on.gif";

        engineeringservices_off = new Image();
        engineeringservices_off.src = "images/davall_nav_engineeringservices_off.gif";
        engineeringservices_on = new Image();
        engineeringservices_on.src = "images/davall_nav_engineeringservices_on.gif";

        spiradrivesystems_off = new Image();
        spiradrivesystems_off.src = "images/davall_nav_spiradrivesystems_off.gif";
        spiradrivesystems_on = new Image();
        spiradrivesystems_on.src = "images/davall_nav_spiradrivesystems_on.gif";

        endiconsystems_off = new Image();
        endiconsystems_off.src = "images/davall_nav_endiconsystems_off.gif";
        endiconsystems_on = new Image();
        endiconsystems_on.src = "images/davall_nav_endiconsystems_on.gif";

        concurvegearsystems_off = new Image();
        concurvegearsystems_off.src = "images/davall_nav_concurvegearsystems_off.gif";
        concurvegearsystems_on = new Image();
        concurvegearsystems_on.src = "images/davall_nav_concurvegearsystems_on.gif";

        orderonline_off = new Image();
        orderonline_off.src = "images/davall_nav_orderonline_off.gif";
        orderonline_on = new Image();
        orderonline_on.src = "images/davall_nav_orderonline_on.gif";

        orderliterature_off = new Image();
        orderliterature_off.src = "images/davall_nav_orderliterature_off.gif";
        orderliterature_on = new Image();
        orderliterature_on.src = "images/davall_nav_orderliterature_on.gif";
        
        requestliterature_off = new Image();
        requestliterature_off.src = "images/davall_nav_requestliterature_off.gif"
        requestliterature_on = new Image();
        requestliterature_on.src = "images/davall_nav_requestliterature_on.gif";

        aboutus_off = new Image();
        aboutus_off.src = "images/davall_nav_aboutus_off.gif";
        aboutus_on = new Image();
        aboutus_on.src = "images/davall_nav_aboutus_on.gif";

        contactus_off = new Image();
        contactus_off.src = "images/davall_nav_contactus_off.gif";
        contactus_on = new Image();
        contactus_on.src = "images/davall_nav_contactus_on.gif";

        phoneme_off = new Image();
        phoneme_off.src = "images/davall_nav_phoneme_off.gif";
        phoneme_on = new Image();
        phoneme_on.src = "images/davall_nav_phoneme_on.gif";

        home_off = new Image();
        home_off.src = "images/davall_nav_home_off.gif";
        home_on = new Image();
        home_on.src = "images/davall_nav_home_on.gif";

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            {
            document.images[imgName].src = eval(imgObjName + ".src");
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        function openWindow(url, w, h)
          {
          var windowprops = "scrollbars,resizable,width=" + w + ",height=" + h;
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