Added is_cli_request() method to documentation for Input class.
diff --git a/system/helpers/form_helper.php b/system/helpers/form_helper.php
index 5323097..8aa788c 100644
--- a/system/helpers/form_helper.php
+++ b/system/helpers/form_helper.php
@@ -49,11 +49,15 @@
 			$attributes = 'method="post"';
 		}
 
+		// If an action is not a full URL then turn it into one
 		if ($action && strpos($action, '://') === FALSE)
 		{
 			$action = $CI->config->site_url($action);
 		}
 
+		// If no action is provided then set to the current url
+		$action OR $action = $CI->config->site_url($CI->uri->uri_string());
+
 		$form = '<form action="'.$action.'"';
 
 		$form .= _attributes_to_string($attributes, TRUE);