if(navigator.appName != 'Netscape') {
// do nothing
}
else { 
  // netscape 6
  if(navigator.appVersion.indexOf('5')==0) {		
    // do nothing
  }
  // netscape 4 and below
  else {
    document.write('<div align=right><font face="Arial, Helvetica, sans-serif" size="1"><a href="javascript:void(0);" onMouseDown="up()" onMouseUp="clearup()" onClick="return false" onMouseOut="clearup()"><br>');
    document.write('Up</a>');
    document.write(' | <a href="javascript:void(0);" onMouseDown="down()" onMouseUp="cleardown()" onClick="return false" onMouseOut="cleardown()">Down</a> | <a href="javascript:void(0);" onClick="if (document.layers) scrolldoc.top=0;return false">Top</a>');
    document.write(' | <a href="javascript:void(0);" onClick="if (document.layers) scrolldoc.top=scrolldoc.document.height*(-1)+150;return false">Bottom</a>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br>');
    document.write('</font></div>');
  }
}