Index: wp-includes/js/quicktags.dev.js
===================================================================
--- wp-includes/js/quicktags.dev.js	(revision 17948)
+++ wp-includes/js/quicktags.dev.js	(working copy)
@@ -259,7 +259,8 @@
 	}
 	document.write('<input type="button" id="ed_spell" class="ed_button" onclick="edSpell(edCanvas);" title="' + quicktagsL10n.dictionaryLookup + '" value="' + quicktagsL10n.lookup + '" />');
 	document.write('<input type="button" id="ed_close" class="ed_button" onclick="edCloseAllTags();" title="' + quicktagsL10n.closeAllOpenTags + '" value="' + quicktagsL10n.closeTags + '" />');
-	document.write('<input type="button" id="ed_fullscreen" class="ed_button" onclick="fullscreen.on();" title="' + quicktagsL10n.toggleFullscreen + '" value="' + quicktagsL10n.fullscreen + '" />');
+	if( 'comment' != pagenow )
+		document.write('<input type="button" id="ed_fullscreen" class="ed_button" onclick="fullscreen.on();" title="' + quicktagsL10n.toggleFullscreen + '" value="' + quicktagsL10n.fullscreen + '" />');
 //	edShowLinks(); // disabled by default
 	document.write('</div>');
 }