function Picture(P_file,P_width,P_height) {
  xref='50';
  yref='50';
  filename='Pics/' + P_file;
  features='width=' + P_width + ',height=' + P_height + ',left=' + xref + ',top=' + yref + ',resizable=yes' + ',scrollbars=no' + ',menubar=no';
  BildWin = window.open(filename,"BTS",features);
  BildWin.focus();
}