Index: public/wikisoftware/includes/Linker.php
===================================================================
--- public/wikisoftware/includes/Linker.php	(revision 2000)
+++ public/wikisoftware/includes/Linker.php	(revision 2011)
@@ -904,6 +904,7 @@
 				'alt' => $fp['alt'],
 				'title' => $fp['title'],
 				'img-class' => 'thumbimage',
+        'onclick' => 'return hs.expand(this,{src:\''.$file->getUrl().'\'})',
 				'desc-link' => true,
 				'desc-query' => $query ) );
 			if ( isset( $fp['framed'] ) ) {
Index: public/wikisoftware/includes/MediaTransformOutput.php
===================================================================
--- public/wikisoftware/includes/MediaTransformOutput.php	(revision 2000)
+++ public/wikisoftware/includes/MediaTransformOutput.php	(revision 2011)
@@ -182,6 +182,9 @@
 		if ( !empty( $options['img-class'] ) ) {
 			$attribs['class'] = $options['img-class'];
 		}
+    if ( !empty( $options['onclick'] ) ) {
+       $attribs['onclick'] = $options['onclick'];
+    }
 		return $this->linkWrap( $linkAttribs, Xml::element( 'img', $attribs ) );
 	}