function generateChatbox()
  {
   var textarea = document.getElementById('channelname');
   wi = document.getElementById('width');
   he = document.getElementById('height');
   co = document.getElementById('code');
   channel = textarea.value.replace(' ', '_');
   co.value = '<script src="http://www.mijnchat.nl/chat/?chatbox=' + channel + "&height=" + he.value + "&width=" + wi.value + '"></script>';
  }