sub go_to {
   my $sw = MainWindow->new(-title=>"Go To Line");
   my $frame = $sw->Frame->pack(-side => 'top', -fill => 'x');
   $frame->Label(-text => "Enter Line Number:")->pack(-side => 'left', -anchor => 'w');
   $frame->Entry(-textvariable => \$line_number)->
      pack(-side => 'left', -anchor => 'w', -fill => 'x', -expand => 1);
   $frame->Button(-text => "GO", -background => 'navy blue', -foreground => 'white', -command =>\&scroll_line)->
      pack(-side => 'right');

   sub scroll_line {
      $line_number = $line_number - 1;
      my $calc = $line_number/$line_count;
      $t->yviewMoveto($calc);
      $line_number = $line_number + 1;
   }
}