if (window.name != 'window1')
  {
  var Iwant = window.location.href;
  var b = 'frame'; 
  var pv = Iwant.indexOf("?b=");
  if (pv != -1) {
    b = Iwant.substring(pv+3,Iwant.length); 
    var zB = Iwant.substring(0,pv);
  } else { 
    var zB = Iwant;  
  }
  var Plaats = Iwant.indexOf("/",Iwant.indexOf("//")+2); 
	var url = Iwant.substring(0,Plaats);
    if (self==top)
    {
      top.location=url+"/mainCont.html?"+zB; 
    } else 
		if (window.name!='window2' && top.frames[b] == null) 
    {
      browserwin = window.open(url+"/mainCont.html?"+zB,"window2","resizable=yes,statusbar=yes,scrollbars=yes,toolbar=yes,location=yes,menubar=yes,status=yes");
      history.go(-1);
   } 
}