This requires you to perform three steps:
1) Step one
Edit themes/yourtheme/theme.php, find the variable definition for$template_display_media
and edit as suggested below. If that definition doesn't reside in your custom theme, copy// HTML template for intermediate image display
$template_display_media = <<<EOT
<tr>
<td align="center" class="display_media" nowrap="nowrap">
<table cellspacing="2" cellpadding="0" class="imageborder">
<tr>
<td align="center">
{IMAGE}
</td>
</tr>
</table>
</td></tr>
<tr><td>
<table width="100%" cellspacing="2" cellpadding="0" class="tableb">
<tr>
<td align="center">
{ADMIN_MENU}
</td>
</tr>
</table>
<!-- BEGIN img_desc -->
<table cellpadding="0" cellspacing="0" class="tableb" width="100%">
<!-- BEGIN title -->
<tr>
<td class="tableb"><center><b>
{TITLE}
</b></center></td>
</tr>
<!-- END title -->
<!-- BEGIN caption -->
<tr>
<td class="tableb"><center>
{CAPTION}
</center></td>
</tr>
<!-- END caption -->
</table>
<!-- END img_desc -->
</td>
</tr>
EOT;
from themes/sample/theme.php into a new line before?>
of the file themes/yourtheme/theme.php first.
Here's what you need to edit: find<!-- BEGIN img_desc -->
<table cellpadding="0" cellspacing="0" class="tableb" width="100%">
and add after it (into a new line)<!-- BEGIN custom_intermediate_link -->
<tr>
<td class="tableb"><center><b>
{CUSTOM_INTERMEDIATE_LINK}
</b></center></td>
</tr>
<!-- END custom_intermediate_link -->
2) Step two
Edit themes/yourtheme/theme.php, find the function definition for theme_html_picture()
and edit as suggested below. If that function definition doesn't exist in your custom theme, copy// Displays a picture
function theme_html_picture()
{
global $CONFIG, $CURRENT_PIC_DATA, $CURRENT_ALBUM_DATA, $USER;
global $album, $comment_date_fmt, $template_display_media;
global $lang_display_image_php, $lang_picinfo;
$pid = $CURRENT_PIC_DATA['pid'];
$pic_title = '';
if (!isset($USER['liv']) || !is_array($USER['liv'])) {
$USER['liv'] = array();
}
// Add 1 to hit counter
if (!USER_IS_ADMIN && !in_array($pid, $USER['liv']) && isset($_COOKIE[$CONFIG['cookie_name'] . '_data'])) {
add_hit($pid);
if (count($USER['liv']) > 4) array_shift($USER['liv']);
array_push($USER['liv'], $pid);
}
if($CONFIG['thumb_use']=='ht' && $CURRENT_PIC_DATA['pheight'] > $CONFIG['picture_width'] ){ // The wierd comparision is because only picture_width is stored
$condition = true;
}elseif($CONFIG['thumb_use']=='wd' && $CURRENT_PIC_DATA['pwidth'] > $CONFIG['picture_width']){
$condition = true;
}elseif($CONFIG['thumb_use']=='any' && max($CURRENT_PIC_DATA['pwidth'], $CURRENT_PIC_DATA['pheight']) > $CONFIG['picture_width']){
$condition = true;
}else{
$condition = false;
}
if ($CURRENT_PIC_DATA['title'] != '') {
$pic_title .= $CURRENT_PIC_DATA['title'] . "\n";
}
if ($CURRENT_PIC_DATA['caption'] != '') {
$pic_title .= $CURRENT_PIC_DATA['caption'] . "\n";
}
if ($CURRENT_PIC_DATA['keywords'] != '') {
$pic_title .= $lang_picinfo['Keywords'] . ": " . $CURRENT_PIC_DATA['keywords'];
}
if (!$CURRENT_PIC_DATA['title'] && !$CURRENT_PIC_DATA['caption']) {
template_extract_block($template_display_media, 'img_desc');
} else {
if (!$CURRENT_PIC_DATA['title']) {
template_extract_block($template_display_media, 'title');
}
if (!$CURRENT_PIC_DATA['caption']) {
template_extract_block($template_display_media, 'caption');
}
}
$CURRENT_PIC_DATA['menu'] = html_picture_menu(); //((USER_ADMIN_MODE && $CURRENT_ALBUM_DATA['category'] == FIRST_USER_CAT + USER_ID) || ($CONFIG['users_can_edit_pics'] && $CURRENT_PIC_DATA['owner_id'] == USER_ID && USER_ID != 0) || GALLERY_ADMIN_MODE) ? html_picture_menu($pid) : '';
if ($CONFIG['make_intermediate'] && $condition ) {
$picture_url = get_pic_url($CURRENT_PIC_DATA, 'normal');
} else {
$picture_url = get_pic_url($CURRENT_PIC_DATA, 'fullsize');
}
$image_size = compute_img_size($CURRENT_PIC_DATA['pwidth'], $CURRENT_PIC_DATA['pheight'], $CONFIG['picture_width']);
$pic_title = '';
$mime_content = cpg_get_type($CURRENT_PIC_DATA['filename']);
if ($mime_content['content']=='movie' || $mime_content['content']=='audio') {
if ($CURRENT_PIC_DATA['pwidth']==0 || $CURRENT_PIC_DATA['pheight']==0) {
$CURRENT_PIC_DATA['pwidth'] = 320; // Default width
// Set default height; if file is a movie
if ($mime_content['content']=='movie') {
$CURRENT_PIC_DATA['pheight'] = 240; // Default height
}
}
$ctrl_offset['mov']=15;
$ctrl_offset['wmv']=45;
$ctrl_offset['swf']=0;
$ctrl_offset['rm']=0;
$ctrl_offset_default=45;
$ctrl_height = (isset($ctrl_offset[$mime_content['extension']]))?($ctrl_offset[$mime_content['extension']]):$ctrl_offset_default;
$image_size['whole']='width="'.$CURRENT_PIC_DATA['pwidth'].'" height="'.($CURRENT_PIC_DATA['pheight']+$ctrl_height).'"';
}
if ($mime_content['content']=='image') {
if (isset($image_size['reduced'])) {
$winsizeX = $CURRENT_PIC_DATA['pwidth']+5; //the +'s are the mysterious FF and IE paddings
$winsizeY = $CURRENT_PIC_DATA['pheight']+3; //the +'s are the mysterious FF and IE paddings
$pic_html = "<a href=\"javascript:;\" onclick=\"MM_openBrWindow('displayimage.php?pid=$pid&fullsize=1','" . uniqid(rand()) . "','scrollbars=yes,toolbar=no,status=no,resizable=yes,width=$winsizeX,height=$winsizeY')\">";
$pic_title = $lang_display_image_php['view_fs'] . "\n==============\n" . $pic_title;
$pic_html .= "<img src=\"" . $picture_url . "\" class=\"image\" border=\"0\" alt=\"{$lang_display_image_php['view_fs']}\" /><br />";
$pic_html .= "</a>\n";
} else {
$pic_html = "<img src=\"" . $picture_url . "\" {$image_size['geom']} class=\"image\" border=\"0\" alt=\"\" /><br />\n";
}
} elseif ($mime_content['content']=='document') {
$pic_thumb_url = get_pic_url($CURRENT_PIC_DATA,'thumb');
$pic_html = "<a href=\"{$picture_url}\" target=\"_blank\" class=\"document_link\"><img src=\"".$pic_thumb_url."\" border=\"0\" class=\"image\" /></a>\n<br />";
} else {
$autostart = ($CONFIG['media_autostart']) ? ('true'):('false');
$players['WMP'] = array('id' => 'MediaPlayer',
'clsid' => 'classid="clsid:6BF52A52-394A-11d3-B153-00C04F79FAA6" ',
'codebase' => 'codebase="http://activex.microsoft.com/activex/controls/mplayer/en/nsmp2inf.cab#Version=5,1,52,701" ',
'mime' => 'type="application/x-mplayer2" ',
);
$players['RMP'] = array('id' => 'RealPlayer',
'clsid' => 'classid="clsid:CFCDAA03-8BE4-11cf-B84B-0020AFBBCCFA" ',
'codebase' => '',
'mime' => 'type="audio/x-pn-realaudio-plugin" '
);
$players['QT'] = array('id' => 'QuickTime',
'clsid' => 'classid="clsid:02BF25D5-8C17-4B23-BC80-D3488ABDDC6B" ',
'codebase' => 'codebase="http://www.apple.com/qtactivex/qtplugin.cab" ',
'mime' => 'type="video/x-quicktime" '
);
$players['SWF'] = array('id' => 'SWFlash',
'clsid' => ' classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" ',
'codebase' => 'codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,0,0" ',
'mime' => 'type="application/x-shockwave-flash" '
);
$players['UNK'] = array('id' => 'DefaultPlayer',
'clsid' => '',
'codebase' => '',
'mime' => ''
);
if (isset($_COOKIE[$CONFIG['cookie_name'].'_'.$mime_content['extension'].'player'])) {
$user_player = $_COOKIE[$CONFIG['cookie_name'].'_'.$mime_content['extension'].'player'];
} else {
$user_player = $mime_content['player'];
}
// There isn't a player selected or user wants client-side control
if (!$user_player) {
$user_player = 'UNK';
}
$player = $players[$user_player];
$pic_html = '<object id="'.$player['id'].'" '.$player['clsid'].$player['codebase'].$player['mime'].$image_size['whole'].'>';
$pic_html .= "<param name=\"autostart\" value=\"$autostart\" /><param name=\"src\" value=\"". $picture_url . "\" />";
$pic_html .= '<embed '.$image_size['whole'].' src="'. $picture_url . '" autostart="'.$autostart.'" '.$player['mime'].'></embed>';
$pic_html .= "</object><br />\n";
}
$CURRENT_PIC_DATA['html'] = $pic_html;
$CURRENT_PIC_DATA['header'] = '';
$CURRENT_PIC_DATA['footer'] = '';
$CURRENT_PIC_DATA = CPGPluginAPI::filter('file_data',$CURRENT_PIC_DATA);
$params = array('{CELL_HEIGHT}' => '100',
'{IMAGE}' => $CURRENT_PIC_DATA['header'].$CURRENT_PIC_DATA['html'].$CURRENT_PIC_DATA['footer'],
'{ADMIN_MENU}' => $CURRENT_PIC_DATA['menu'],
'{TITLE}' => bb_decode($CURRENT_PIC_DATA['title']),
'{CAPTION}' => bb_decode($CURRENT_PIC_DATA['caption']),
);
return template_eval($template_display_media, $params);
}
from themes/sample/theme.php into a new line before ?>
of the file themes/yourtheme/theme.php.
In that function definition, find '{CAPTION}' => bb_decode($CURRENT_PIC_DATA['caption']),
and add after it (into a new line) '{CUSTOM_INTERMEDIATE_LINK}' => $lang_display_image_php['custom_intermediate_link'],
3) Step 3
Edit lang/yourlanguage.php (e.g. lang/english.php), find 'set_player' => 'Change player',
in the definition section for the array $lang_display_image_php and add after it (into a new line) 'custom_intermediate_link' => 'your custom content - can be anything you could think of',
Repeat the last step for all languages you need to see changed.
Coded out of the back of my head (without actually testing it), please report back.
There are in fact many methods to add custom content on that page, so you may find other methods to accomplish the same thing, some of them even less complicated. Search for the term "adsense" for details if you want another solution.