function preload_images() {
         tempimage = new Image();
         for(i = 1; i <= 6; i++) {
             tempimage.src = "images/menu0" + i + ".gif";
             tempimage.src = "images/menu0" + i + "_.gif";
         }
}

function gen_navbutton(url, image, mouseoverimage, alttext) {
         if(menuhighlight == alttext)
                  return '<tr><td height="24" align="center"><a href="' + url + '"><img border="0" src="' + mouseoverimage + '" width="200" height="24" alt="' + alttext + '"></a></td></tr>\n';
         else
                  return '<tr><td height="24" align="center"><a href="' + url + '"><img border="0" src="' + image + '" width="200" height="24" onmouseout="this.src = \'' + image + '\';" onMouseOver="this.src = \'' + mouseoverimage + '\';" alt="' + alttext + '"></a></td></tr>\n';
}

function build_navigation() {
         var seperatorline = '<tr><td height="1"><img src="images/lijntje.gif" width="216" height="2"></td></tr>\n';
         navigationmenu = '<table width="100%" border="0" cellspacing="0" cellpadding="0"><tr><td height="24">&nbsp;</td></tr>\n';
         navigationmenu += seperatorline;
         navigationmenu += gen_navbutton("e-donations.html", "images/menu01.gif", "images/menu01_.gif", "e-donations");
         navigationmenu += seperatorline;
         navigationmenu += gen_navbutton("cashmanagement.html", "images/menu02.gif", "images/menu02_.gif", "cash management");
         navigationmenu += seperatorline;
         navigationmenu += gen_navbutton("fulfilment.html", "images/menu03.gif", "images/menu03_.gif", "fulfilment");
         navigationmenu += seperatorline;
         navigationmenu += gen_navbutton("e-commerce.html", "images/menu04.gif", "images/menu04_.gif", "e-commerce");
         navigationmenu += seperatorline;
         navigationmenu += gen_navbutton("e-ticketing.html", "images/menu05.gif", "images/menu05_.gif", "e-ticketing");
         navigationmenu += seperatorline;
         navigationmenu += gen_navbutton("contact.html", "images/menu06.gif", "images/menu06_.gif", "contact");
         navigationmenu += seperatorline;
	     navigationmenu += '</table>';
         document.write(navigationmenu);
}
preload_images();