sub renderThumbnails {

  my $this = shift;

  #writeDebug("renderThumbnails()");

  if (!@{$this->{images}}) {
    return renderError($this->{warn}); 
  }

  my $maxCols = $this->{columns};
  my $result = "<div class=\"igpThumbNails\"><table class=\"igpThumbNailsTable\"><tr>\n";
  my $imageNr = 0;
  my @rowOfImages = ();
  my $skip = $this->{skip};
  foreach my $image (@{$this->{images}}) {
    $this->computeImageSize($image);

    $skip--;
    next if $skip >= 0;
    last if $this->{limit} && $imageNr >= $this->{limit};

    if ($this->{doThumbTitles}) {
      push @rowOfImages, $image;
    }
    if ($imageNr % $maxCols == 0) {
      $result .="<tr>";
    }
    $result .= "<td width=\"" . (100 / $maxCols) . "%\" class=\"igpThumbNail\"><a href=\""
      .  TWiki::Func::getViewUrl($image->{IGP_web}, $image->{IGP_topic})
      . "?id=$this->{id}&filename=$image->{name}#igp$this->{id}\">"
      . "<img src=\"$this->{imagesPubUrl}/thumb_$image->{name}"
      . (($image->{name} =~ /\.svgz?$/ )?'.png':'')
      . "\" title=\"$image->{IGP_comment}\" alt=\"$image->{name}\"/></a></td>\n";

    if (!$this->createImg($image, 1)) {
      return renderError($this->{errorMsg});
    }

    $imageNr++;
    if ($imageNr % $maxCols == 0) {
      $result .= "</tr>\n";
      if ($this->{doThumbTitles}) {
        $result .= $this->renderTitleRow(\@rowOfImages);
        @rowOfImages = ();
      }
    }
  }
  if ($imageNr % $maxCols != 0) {
    while ($imageNr % $maxCols != 0) {
      $result .= "<td>&nbsp;</td>\n";
      $imageNr++;
    }
    $result .= "</tr>\n";
    if ($this->{doThumbTitles}) {
      $result .= $this->renderTitleRow(\@rowOfImages);
    }
  }
  $result .= "</table></div>\n";

  return $result;
}