Manual:Non-clickable Images
From MediaWiki.org
[edit] Warning
The following involves editing Linker.php, a core MediaWiki file. It is a very simple procedure, but if you feel at all uncomfortable editing core files, do not do so. Make sure to create a backup copy of Linker.php before making the suggested edit.
[edit] How to
Open the file Linker.php from your includes folder and go to the function makeImageLink2. Find the lines:
if ( !$thumb ) { $s = $this->makeBrokenImageLinkObj( $title ); } else { $s = $thumb->toHtml( array( 'desc-link' => true, 'alt' => $fp['alt'], 'valign' => isset( $fp['valign'] ) ? $fp['valign'] : false , 'img-class' => isset( $fp['border'] ) ? 'thumbborder' : false ) ); }
Change the value of 'desc-link' from true to false so that it now appears as
if ( !$thumb ) { $s = $this->makeBrokenImageLinkObj( $title ); } else { $s = $thumb->toHtml( array( 'desc-link' => false, 'alt' => $fp['alt'], 'valign' => isset( $fp['valign'] ) ? $fp['valign'] : false , 'img-class' => isset( $fp['border'] ) ? 'thumbborder' : false ) ); }
The images in your wiki should now be non-clickable.