function popupWindow( url,  win, width, height, scrollbars){
   popWindow ( url, width, height, win, scrollbars, false )
}

function popWindow ( url, width, height, win, scrollbars, resizable ) {
   if(!scrollbars)
	   scrollbars = 0;
   else
	   scrollbars = 1;
   if(!resizable)
	   resizable = 0;
   else 
	   resizable = 1;
   var left = ( screen.width - width ) / 2;
   var top = ( screen.height - height ) / 2;
   if ( win == undefined ) win = "_blank";
      newwindow = window.open ( url, win, 'toolbar=0,location=0,status=0,menubar=0,scrollbars='+scrollbars+',resizable='+resizable+',width=' + width + ',height=' + height + ',left=' + left + ',top=' + top );

   if ( window.focus )
      newwindow.focus ();
}