function openWnd(url,wnd_name,width,height,scrollbars){		
  var stScrollBar = (scrollbars ? 'yes' : 'no');
  window.open(url,'','width='+width+',height='+height+',status=yes,menubar=no,resizable=yes,scrollbars='+stScrollBar+',left='+String((screen.width-width)/2)+',top='+String((screen.height-height)/2));
}