function mouseDown(was) {
    if ((ns && was.which == 1) || ie) {
      if (ns) {
        var x=was.pageX;
        var y=was.pageY;
      }
      if (ie) {
        var x=event.x+document.body.scrollLeft;
        var y=event.y+document.body.scrollTop;
      }
      if (x>=Ebene1.xx && x<=Ebene1.xx+Ebene1.bb && y>=Ebene1.yy && y<=Ebene1.yy+Ebene1.hh) {
        mausX = x-Ebene1.xx;
        mausY = y-Ebene1.yy;
        maus = 1;
        return true;
      }
    }
  }

  function mouseMove(was) {
    if (ns) {
      var x=was.pageX;
      var y=was.pageY;
    }
    if (ie) {
      var x=event.x+document.body.scrollLeft;
      var y=event.y+document.body.scrollTop;
    }
    if (maus) {
      Ebene1.xx = x-mausX;
      Ebene1.yy = y-mausY;
      Ebene1.left = Ebene1.xx;
      Ebene1.top = Ebene1.yy;
      return false;
    }
  }

  function mouseUp(was) {
    if (ns) {
      var x=was.pageX;
      var y=was.pageY;
    }
    if (ie) {
      var x=event.x+document.body.scrollLeft;
      var y=event.y+document.body.scrollTop;
    }
    maus = 0;
      return true;
  }