//Popup Modul

var pop = null;

function popdown() {
  if (pop && !pop.closed) pop.close();
}

function popup(filename, winwidth, winheight) {
  winwidth = (winwidth) ? winwidth += 20 : 200;  // 200px*200px default
  winheight = (winheight) ? winheight += 25 : 200;
  var params = "width="+winwidth+",height="+winheight+",scrollbars=yes"; 
  popdown();
  pop = window.open(filename,"Popup",params);
    return (pop) ? false : true; false;
}

window.onunload = popdown;
window.onfocus = popdown;