function load_mpt_app() {
  //width=800,height=700,top=100,left=100,
  var add   = "";
  var breite  = screen.availWidth
  var hoehe   = screen.availHeight
  var wbreite = screen.availWidth-200 //Fensterbreite
  var whoehe  = screen.availHeight-200  //Fensterhöhe
  
  width = breite - wbreite
  width = width / 2
  
  if (wbreite < 1000) {
    wbreite = 1024;
  }
  
//  height = hoehe - whoehe
//  height = height / 2
  height = 75;

  if (whoehe < 750) {
    whoehe = 768;
    height = 0;
  }
  //###################################################################
  id = load_mpt_app.arguments[0];
  txt = load_mpt_app.arguments[1];
  
  if (id == true) {
    url = "agency.php?client_login=true"
  } else {
  
    if (id != undefined) {
      add = "?mod=mediasheet&id="+id;
    }
    
    if (txt == "true") {
      alert("Attention, you have to save your changes before you can view them in the following MediaSheet.");
    }
    //###################################################################
    url = "window.php"+add
  }
  
  url = "http://mediatool.adlink.net/" + url;
  
  window.open(url,"mediatool_win","width="+wbreite+",height="+whoehe+",top="+height+",left="+width+",scrollbars=yes,resizable=yes");
}