function openWindow(url,width,height,scroll)
{
  if (width == 0)
   {
     win = window.open(url,'_blank');
   }
  else
  if (window.showModalDialog)
    {
      if (!scroll) scroll = "No";
      win = window.showModalDialog(url,'args','dialogHeight: '+height+'px; dialogWidth: '+width+'px; dialogTop: px; dialogLeft: px; edge: Raised; center: Yes; help: No; resizable: Yes; status: No; scroll: ' + scroll);
    }
  else
    {
		height = height - 50;
		wleft = (screen.width - width) / 2;
		wtop = (screen.height - height) / 2;
		win = window.open(url,'_blank','status=no,height='+height+',width='+width+',top='+wtop+',left='+wleft+',scrollbars='+scroll);
    }
}