sub close {
   open (TEMP, ">compare");
   print TEMP $t->get("1.0", "end");
   close(TEMP);
   print "\$filename equals ",$filename,"\n";
   if (compare($filename,"compare") == 0) {
      print "They are the same\n";
      exit;
   }elsif (compare($filename,"compare") == -1) {
      $t->insert("end", "There was an error while comparing!\n");
   }else{
      print "They are different\n";
      my $sw = MainWindow->new(-title=>"Content Has Changed");
      my $frame = $sw->Frame->pack(-side => 'top', -fill => 'x');
      $frame->Label(-text => "The file has changed since last save. Would you like to save before exiting?")->
                    pack(-side => 'left', -anchor => 'w');
      $frame->Button(-text => "No", -background => 'navy blue', -foreground => 'white', -command => sub {exit;})->
         pack(-side => 'right'); 
      $frame->Button(-text => "Yes", -background => 'navy blue', -foreground => 'white', -command =>\&save_and_exit)->
         pack(-side => 'right'); 
   }
}