This is a jQuery extension plugin that adds two functions to lock and unlock user interface. User will not be able click or interact with you website or page. You will need to unlock the page using $.uiUnlock();.
Two added funtions are:$.uiLock('Optional content, like loading gif image');$.uiUnlock();
This is useful while you are AJAX loading some content and would not like the user to click on some other link or button on your page.