the above advice is not complete and invalid in the context of what the original poster wanted. Here you go:
1. add new type to the $aPhotoTypes array in config/lang_en.php: $aPhotoTypes[3] = 'Top';
2. modify function listImagesByTypes() in core/files.php, line: if( $iType < 3 ){ to: if( $iType < 5 ){
3. add additional image placement block in templates/pages_default.tpl:
<!-- BEGIN IMAGES_LIST_3 --><li><img src="$config[dir_files]$aData[iSizeValue2]/$aData[sFileName]" alt="$aData[sDescription]" />$aData[sDescriptionContent]</li><!-- END IMAGES_LIST_3 --> <!-- BEGIN IMAGES_DESCRIPTION_3 --><div>$aData[sDescription]</div><!-- END IMAGES_DESCRIPTION_3 --> <!-- BEGIN IMAGES_HEAD_3 --><ul class="imagesList" id="imagesList3"><!-- END IMAGES_HEAD_3 --> <!-- BEGIN IMAGES_FOOT_3 --></ul><!-- END IMAGES_FOOT_3 -->
