// Script by Thomas Stich
// http://www.stichpunkt.de/beitrag/popup.html
// use it if you like it
// 
// <a href="html-or.jpg" onclick="return popup(this,123,456)" title="..."
// or
// <a href="html-or.jpg" onclick="return popup(this)" title="..."


var pop = null;

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

function popup(obj,w,h) {
  var url = (obj.getAttribute) ? obj.getAttribute('href') : obj.href;
  if (!url) return true;
  w = (w) ? w += 20 : 150;  // 150px*150px is the default size
  h = (h) ? h += 25 : 150;
  var args = 'width='+w+',height='+h+',resizable';
  popdown();
  pop = window.open(url,'',args);
  return (pop) ? false : true;
}

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


// andere version

var winvar=null;
function OpenWindow(url, width, height) { 
if (winvar && (navigator.appName == "Microsoft Internet Explorer" || winvar.document))
         winvar.close();
winvar = open(url,"","width="+width+",height="+height+",menubar=no,toolbar=no,location=no,statusbar=0,resizable=no");
                winvar.moveTo(screen.width/2-width/2,screen.height/2-height/2);
        winvar.focus();
        }