fixed a syntax bug in strip_imge_tags
diff --git a/system/libraries/Validation.php b/system/libraries/Validation.php
index 7720a7d..c81ad6b 100644
--- a/system/libraries/Validation.php
+++ b/system/libraries/Validation.php
@@ -731,7 +731,7 @@
 	 */	

 	function strip_image_tags($str)

 	{

-		$_POST[$this->_current_field] = $this->input->strip_image_tags($str);

+		$_POST[$this->_current_field] = $this->CI->input->strip_image_tags($str);

 	}

 	

 	// --------------------------------------------------------------------