diff --git a/system/helpers/form_helper.php b/system/helpers/form_helper.php
index 53ee8eb..c77069c 100644
--- a/system/helpers/form_helper.php
+++ b/system/helpers/form_helper.php
@@ -197,7 +197,7 @@
 	 *
 	 * @param	mixed
 	 * @param	string
-	 * @param	string
+	 * @param	mixed
 	 * @return	string
 	 */
 	function form_input($data = '', $value = '', $extra = '')
@@ -208,6 +208,8 @@
 			'value' => $value
 		);
 
+		$extra = _attributes_to_string($extra);
+
 		return '<input '._parse_form_attributes($data, $defaults).$extra." />\n";
 	}
 }
@@ -223,7 +225,7 @@
 	 *
 	 * @param	mixed
 	 * @param	string
-	 * @param	string
+	 * @param	mixed
 	 * @return	string
 	 */
 	function form_password($data = '', $value = '', $extra = '')
@@ -245,7 +247,7 @@
 	 *
 	 * @param	mixed
 	 * @param	string
-	 * @param	string
+	 * @param	mixed
 	 * @return	string
 	 */
 	function form_upload($data = '', $value = '', $extra = '')
@@ -253,6 +255,9 @@
 		$defaults = array('type' => 'file', 'name' => '');
 		is_array($data) OR $data = array('name' => $data);
 		$data['type'] = 'file';
+
+		$extra = _attributes_to_string($extra);
+		
 		return '<input '._parse_form_attributes($data, $defaults).$extra." />\n";
 	}
 }
@@ -266,7 +271,7 @@
 	 *
 	 * @param	mixed	$data
 	 * @param	string	$value
-	 * @param	string	$extra
+	 * @param	mixed	$extra
 	 * @return	string
 	 */
 	function form_textarea($data = '', $value = '', $extra = '')
@@ -287,6 +292,8 @@
 			unset($data['value']); // textareas don't use the value attribute
 		}
 
+		$extra = _attributes_to_string($extra);
+
 		return '<textarea '._parse_form_attributes($data, $defaults).$extra.'>'.html_escape($val)."</textarea>\n";
 	}
 }
@@ -301,11 +308,13 @@
 	 * @param	string
 	 * @param	array
 	 * @param	mixed
-	 * @param	string
+	 * @param	mixed
 	 * @return	string
 	 */
 	function form_multiselect($name = '', $options = array(), $selected = array(), $extra = '')
 	{
+		$extra = _attributes_to_string($extra);
+
 		if ( ! strpos($extra, 'multiple'))
 		{
 			$extra .= ' multiple="multiple"';
@@ -420,7 +429,7 @@
 	 * @param	mixed
 	 * @param	string
 	 * @param	bool
-	 * @param	string
+	 * @param	mixed
 	 * @return	string
 	 */
 	function form_checkbox($data = '', $value = '', $checked = FALSE, $extra = '')
@@ -450,6 +459,8 @@
 			unset($defaults['checked']);
 		}
 
+		$extra = _attributes_to_string($extra);
+
 		return '<input '._parse_form_attributes($data, $defaults).$extra." />\n";
 	}
 }
@@ -464,13 +475,16 @@
 	 * @param	mixed
 	 * @param	string
 	 * @param	bool
-	 * @param	string
+	 * @param	mixed
 	 * @return	string
 	 */
 	function form_radio($data = '', $value = '', $checked = FALSE, $extra = '')
 	{
 		is_array($data) OR $data = array('name' => $data);
 		$data['type'] = 'radio';
+
+		$extra = _attributes_to_string($extra);
+
 		return form_checkbox($data, $value, $checked, $extra);
 	}
 }
@@ -484,7 +498,7 @@
 	 *
 	 * @param	mixed
 	 * @param	string
-	 * @param	string
+	 * @param	mixed
 	 * @return	string
 	 */
 	function form_submit($data = '', $value = '', $extra = '')
@@ -495,6 +509,8 @@
 			'value' => $value
 		);
 
+		$extra = _attributes_to_string($extra);
+
 		return '<input '._parse_form_attributes($data, $defaults).$extra." />\n";
 	}
 }
@@ -508,7 +524,7 @@
 	 *
 	 * @param	mixed
 	 * @param	string
-	 * @param	string
+	 * @param	mixed
 	 * @return	string
 	 */
 	function form_reset($data = '', $value = '', $extra = '')
@@ -519,6 +535,8 @@
 			'value' => $value
 		);
 
+		$extra = _attributes_to_string($extra);
+
 		return '<input '._parse_form_attributes($data, $defaults).$extra." />\n";
 	}
 }
@@ -532,7 +550,7 @@
 	 *
 	 * @param	mixed
 	 * @param	string
-	 * @param	string
+	 * @param	mixed
 	 * @return	string
 	 */
 	function form_button($data = '', $content = '', $extra = '')
@@ -548,6 +566,8 @@
 			unset($data['content']); // content is not an attribute
 		}
 
+		$extra = _attributes_to_string($extra);
+
 		return '<button '._parse_form_attributes($data, $defaults).$extra.'>'.$content."</button>\n";
 	}
 }