function Popup(url, w, h)
{
  var x = 0;
  var y = 0;
  if((parseInt(navigator.appVersion) >= 4))
  {
    x = (screen.width - w) / 2;
    y = (screen.height - h) / 2;
  }
  if(x < 0)
    x = 0;
  if(y < 0)
    y = 0;
		
	tmp = window.open(url,
	'popup','width=' + w + ',height=' +h + ',location=0,menubar=0,resizable=1,scrollbars=1,status=0,titlebar=0,toolbar=0,hotkeys=0');
	
tmp.focus();
}