Index: SkinTemplate.php
===================================================================
--- SkinTemplate.php	(revision 36858)
+++ SkinTemplate.php	(working copy)
@@ -656,11 +656,13 @@
 		if( $this->iscontent ) {
 			$subjpage = $this->mTitle->getSubjectPage();
 			$talkpage = $this->mTitle->getTalkPage();
-
+			
 			$nskey = $this->mTitle->getNamespaceKey();
+			$atab = $this->mTitle->equals( Title::newMainPage() ) ? 'mainpage-description' : $nskey;			
+			
 			$content_actions[$nskey] = $this->tabAction(
 				$subjpage,
-				$nskey,
+				$atab,
 				!$this->mTitle->isTalkPage() && !$prevent_active_tabs,
 				'', true);