Index: trunk/core/kernel/parser/tags.php
===================================================================
diff -u -N -r7391 -r7635
--- trunk/core/kernel/parser/tags.php	(.../tags.php)	(revision 7391)
+++ trunk/core/kernel/parser/tags.php	(.../tags.php)	(revision 7635)
@@ -322,7 +322,11 @@
 				}
 				return $code;
 			case 'param':
-				$code[] = '$o .= $params["'.$this->NP['name'].'"];';
+				$param_code = '$o .= $params["'.$this->NP['name'].'"]';
+				if (isset($this->NP['plus'])) {
+					$param_code .= ' + '.$this->NP['plus'];
+				}
+				$code[] = $param_code.';';
 				return $code;
 			case 'if':
 				if (isset($this->NP['_closing_tag_'])) {