my $pic = param('pic');
   my $filehandle = upload('pic');
   my $bild = $pic;
   $switch = 1 if $pic;
   my ($file, $baba, $tld);
   $tld = (split(/\./, $pic))[-1];
   $file = $username if $switch == 1;
   $tld = lc($tld);
   $baba = "$file.$tld";
   if($switch == 1)
   {
      open (IMAGE,">/usr/local/httpd/htdocs/userpics/$baba");
      flock IMAGE, 1;
      for(<$filehandle>)
      {
         print IMAGE $_;
      }
      flock IMAGE, 8;
      close(IMAGE);
   }
   my ($width,$height) = imgsize($pic);
   my ($thumbnailwidth, $thumbnailheight) = ($width, $height);
   if($switch == 1)
   {
      my $max_height = 200;
      my $max_width = 300;
      my $relation;
      $relation = ($height / $max_height) > ($width / $max_width) 
         ? $height / $max_height  : $width / $max_width;
      $thumbnailheight = sprintf ("%.0f",$height / $relation);
      $thumbnailwidth = sprintf ("%.0f",$width / $relation);
      my $big = GD::Image->newFromJpeg("/usr/local/httpd/htdocs/userpics/$baba");
      my $lit = new GD::Image($thumbnailwidth,$thumbnailheight);
      $lit->copyResized($big, 0, 0, 0, 0, $thumbnailwidth, $thumbnailheight, $width, $height);
      my $jpeg_data = $lit->jpeg;
      open (OUTFILE,">/usr/local/httpd/htdocs/userpics/$baba");
      print OUTFILE $jpeg_data;
      close OUTFILE;
   }

Sytax Error
Illegal division by zero at /usr/local/httpd/cgi-bin/index.pl line 747, <fh00001ttt.jpg> line 369.