document.imageArray = new Array("topnav_home","topnav_aboutus","topnav_residential","topnav_commercial","topnav_systemtypes","topnav_projects","topnav_yourproject","topnav_ourpartners","topnav_contactus","topnav_sitemap");
        document.statusArray = new Array("Home","About us","Residential","Commercial","System types","Projects","Your project","Our partners","Contact us","Site map");
        document.preloadMenu = new Array("topnav_home","topnav_aboutus","topnav_residential","topnav_commercial","topnav_systemtypes","topnav_projects","topnav_yourproject","topnav_ourpartners","topnav_contactus","topnav_sitemap");

        with (document) for (var i=0; i<document.imageArray.length; i++){
                preloadMenu[i] = new Image;

                preloadMenu[i].src = 'images/' + imageArray[i] + 'R.gif';
        }

        function menuOn(iNum) {
                window.status=document.statusArray[iNum];
                eval('document.images.menu' + iNum + '.src=document.preloadMenu[iNum].src');
        }

        function menuOff(iNum) {
                window.status='';
                eval('document.images.menu' + iNum + '.src="images/' + document.imageArray[iNum] + '.gif"');
        }