Added isset()

diff --git a/plugin/lookup.inc.php b/plugin/lookup.inc.php
index 97bd836..a9fb20c 100644 (file)
--- a/plugin/lookup.inc.php
+++ b/plugin/lookup.inc.php
@@ -1,6 +1,6 @@
 <?php
 // PukiWiki - Yet another WikiWikiWeb clone.
-// $Id: lookup.inc.php,v 1.15 2005/01/08 11:26:22 henoheno Exp $
+// $Id: lookup.inc.php,v 1.16 2005/01/30 10:55:53 henoheno Exp $
 //
 // InterWiki lookup plugin
 
@@ -14,7 +14,7 @@ function plugin_lookup_convert()
 
        $args = func_get_args();
        $interwiki = htmlspecialchars(trim($args[0]));
-       $button    = trim($args[1]);
+       $button    = isset($args[1]) ? trim($args[1]) : '';
        $button    = ($button != '') ? htmlspecialchars($button) : 'lookup';
        $default   = ($num > 2) ? htmlspecialchars(trim($args[2])) : '';
        $s_page    = htmlspecialchars($vars['page']);