offline: hide main toolbar Update button

offline.js

@@ -349,6 +349,10 @@ function init_offline() {
 		Element.hide("feedBrowserPrompt");
 		Element.hide("quickMenuChooser");
 
+		var tb_form = document.getElementById("main_toolbar_form");
+
+		Element.hide(tb_form.update);
+
 		init_params["theme"] = "";
 
 		render_offline_feedlist();

tt-rss.php

@@ -244,7 +244,7 @@ window.onload = init;
 
 		 
 
-		<input class="button" type="submit"
+		<input class="button" type="submit" name="update"
 			onclick="return viewCurrentFeed('ForceUpdate')" 
 			value="<?php echo __('Update') ?>"/>