diff --git a/fp-includes/smarty/Smarty.class.php b/fp-includes/smarty/Smarty.class.php
index 41d5370..3c97b5f 100644
--- a/fp-includes/smarty/Smarty.class.php
+++ b/fp-includes/smarty/Smarty.class.php
@@ -27,7 +27,7 @@
  * @author Monte Ohrt <monte at ohrt dot com>
  * @author Andrei Zmievski <andrei@php.net>
  * @package Smarty
- * @version 2.6.30
+ * @version 2.6.31-dev
  */
 
 /* $Id$ */
@@ -465,7 +465,7 @@ class Smarty
      *
      * @var string
      */
-    var $_version              = '2.6.30';
+    var $_version              = '2.6.31';
 
     /**
      * current template inclusion depth
diff --git a/fp-includes/smarty/plugins/function.math.php b/fp-includes/smarty/plugins/function.math.php
index 655fe72..d0ce1e6 100644
--- a/fp-includes/smarty/plugins/function.math.php
+++ b/fp-includes/smarty/plugins/function.math.php
@@ -18,11 +18,11 @@
  * @author   Monte Ohrt <monte at ohrt dot com>
  *
  * @param array                    $params   parameters
- * @param Smarty_Internal_Template $template template object
+ * @param Smarty
  *
  * @return string|null
  */
-function smarty_function_math($params, $template)
+function smarty_function_math($params, &$smarty)
 {
     static $_allowed_funcs =
         array('int' => true, 'abs' => true, 'ceil' => true, 'cos' => true, 'exp' => true, 'floor' => true,
@@ -58,12 +58,28 @@ function smarty_function_math($params, $template)
         return;
     }
 
+    foreach ($params as $key => $val) {
+        if ($key != "equation" && $key != "format" && $key != "assign") {
+            // make sure value is not empty
+            if (strlen($val) == 0) {
+                trigger_error("math: parameter '{$key}' is empty", E_USER_WARNING);
+
+                return;
+            }
+            if (!is_numeric($val)) {
+                trigger_error("math: parameter '{$key}' is not numeric", E_USER_WARNING);
+
+                return;
+            }
+        }
+    }
+
     // match all vars in equation, make sure all are passed
     preg_match_all('!(?:0x[a-fA-F0-9]+)|([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)!', $equation, $match);
 
     foreach ($match[ 1 ] as $curr_var) {
         if ($curr_var && !isset($params[ $curr_var ]) && !isset($_allowed_funcs[ $curr_var ])) {
-            trigger_error("math: function call $curr_var not allowed", E_USER_WARNING);
+            trigger_error("math: function call '{$curr_var}' not allowed, or missing parameter '{$curr_var}'", E_USER_WARNING);
 
             return;
         }
@@ -71,17 +87,6 @@ function smarty_function_math($params, $template)
 
     foreach ($params as $key => $val) {
         if ($key != "equation" && $key != "format" && $key != "assign") {
-            // make sure value is not empty
-            if (strlen($val) == 0) {
-                trigger_error("math: parameter $key is empty", E_USER_WARNING);
-
-                return;
-            }
-            if (!is_numeric($val)) {
-                trigger_error("math: parameter $key: is not numeric", E_USER_WARNING);
-
-                return;
-            }
             $equation = preg_replace("/\b$key\b/", " \$params['$key'] ", $equation);
         }
     }
@@ -92,13 +97,13 @@ function smarty_function_math($params, $template)
         if (empty($params[ 'assign' ])) {
             return $smarty_math_result;
         } else {
-            $template->assign($params[ 'assign' ], $smarty_math_result);
+            $smarty->assign($params[ 'assign' ], $smarty_math_result);
         }
     } else {
         if (empty($params[ 'assign' ])) {
             printf($params[ 'format' ], $smarty_math_result);
         } else {
-            $template->assign($params[ 'assign' ], sprintf($params[ 'format' ], $smarty_math_result));
+            $smarty->assign($params[ 'assign' ], sprintf($params[ 'format' ], $smarty_math_result));
         }
     }
 }