// JavaScript Document
function MM_reloadPage(init) {  //reloads the window if Nav4 resized
  if (init==true) with (navigator) {if ((appName=="Netscape")&&(parseInt(appVersion)==4)) {
    document.MM_pgW=innerWidth; document.MM_pgH=innerHeight; onresize=MM_reloadPage; }}
  else if (innerWidth!=document.MM_pgW || innerHeight!=document.MM_pgH) location.reload();
}
MM_reloadPage(true);

<!-- Funktion fürs Hochzählen der gemerkten Objekte //-->
function do_it( wert )

{
  document.getElementById('merkzahl').value = '('+wert+')' ;
}


// Browserweiche
var w3c = document.getElementById&&!document.all?1:0;
var msie = document.all?1:0;


function intro() {

 // Event-Listener fuer Doppelklick registrieren 

 if(w3c) { // DOM Level 2 kompatible Browser 
  var field = document.getElementById("MAIN");	// Div-Container MAIN wird angesprochen
  field.addEventListener("dblclick", fetchSel, true);
 }

 if(msie) { // MS Internet Explorer 
  var field = document.all.MAIN;
  field.ondblclick = fetchSel;
 }
}


function fetchSel() {

 // Selektierten Text in Variable speichern

 if(document.selection) {
  selected = document.selection.createRange().text;
  if(selected != "") {
   document.selection.empty();
  }
 }
 else if(window.getSelection) {
  selected = window.getSelection().toString();
  selected = selected.replace(/["!?;:,.]/g, "");
 }
 
 popup(selected);
}


function popup(selected) {

 // Deutsche Wikipedia
 var searchURL = "http://de.wikipedia.org/";
 var attr = "wiki/" + escape(selected);

 // Alternative: Deutsch-Englisches Woerterbuch
 // var searchURL = "http://dict.leo.org/";
 // var attr = "?search=" + escape(selected) + "&amp;lang=en";

 // Parameter fuer das Popup-Fenster
 var param = "width=650,height=450";
 param += ",left=150,top=60";
 param += ",menubar=0";
 param += ",location=1";
 param += ",scrollbars=1";
 param += ",resizable=1";
 param += ",toolbar=0";
 param += ",status=0";

 if(selected != "") {
  // Popup oeffnen
  popWin = window.open(searchURL + attr,"s",param);
  // Popup in den Vordergrund schicken
  popWin.focus();
 }
}