diff --git misc/ajax.js misc/ajax.js
index 553d2cc..791c671 100644
--- misc/ajax.js
+++ misc/ajax.js
@@ -164,7 +164,14 @@ Drupal.ajax = function (base, element, element_settings) {
       $.ajax(options);
     }
 
-    return false;
+    // For radio/checkbox, allow the default event. On IE, this means letting
+    // it actually check the box.
+    if (this.type == 'checkbox' || this.type == 'radio') {
+      return true;
+    }
+    else {
+      return false;
+    }
   });
 
   // If necessary, enable keyboard submission so that AJAX behaviors