var Opened=false;
function OpenWindow(PageSrc,Top,Left,Width,Height)
         {
          Features="top="+Top+",left="+Left+",width="+Width+",height="+Height+",toolbar=no,menubar=no,location=no,directories=no,scrollbars=no,resizable=no";
          if ((!Opened) || (NewWin.closed))
             {
	      Opened=true;
	      NewWin=window.open(PageSrc,"NewWindow",Features);
	      NewWin.focus();
             }    
          else
             {         
	     if ((Opened) || (!NewWin.closed))
	        {
	         NewWin.location=PageSrc;
	         NewWin.focus();
                }
             }
          }