<!-- Paste this code into an external JavaScript file named: ajax_navagation.js  -->

var please_wait = null;

function open_url(url, target) {
     if ( ! document.getElementById) {
          return false;
     }

     if (please_wait != null) {
          document.getElementById(target).innerHTML = please_wait;
     }

     if (window.ActiveXObject) {
          link = new ActiveXObject("Microsoft.XMLHTTP");
     } else if (window.XMLHttpRequest) {
          link = new XMLHttpRequest();
     }

     if (link == undefined) {
          return false;
     }
     link.onreadystatechange = function() { response(url, target); }
     link.open("GET", url, true);
     link.send(null);
}

function response(url, target) {
     if (link.readyState == 4) {
         document.getElementById(target).innerHTML = (link.status == 200) ? link.responseText : "Na Sowas! Die Seite gibts nicht! Probiere eine andere.";
    }
}

function set_loading_message(msg) {
     please_wait = msg;
}