#152098 by mgifford: Improve accessibility of radios and checkboxes.

includes/form.inc

@@ -1548,7 +1548,7 @@ function theme_radio($element) {
   $output .= (check_plain($element['#value']) == $element['#return_value']) ? ' checked="checked" ' : ' ';
   $output .= drupal_attributes($element['#attributes']) . ' />';
   if (!is_null($element['#title'])) {
-    $output = '<label class="option">' . $output . ' ' . $element['#title'] . '</label>';
+    $output = '<label class="option" for="' . $element['#id'] . '">' . $output . ' ' . $element['#title'] . '</label>';
   }
 
   unset($element['#title']);
@@ -1976,7 +1976,7 @@ function theme_checkbox($element) {
   $checkbox .= drupal_attributes($element['#attributes']) . ' />';
 
   if (!is_null($element['#title'])) {
-    $checkbox = '<label class="option">' . $checkbox . ' ' . $element['#title'] . '</label>';
+    $checkbox = '<label class="option" for="' . $element['#id'] . '">' . $checkbox . ' ' . $element['#title'] . '</label>';
   }
 
   unset($element['#title']);