[jQuery] using blockui, unblock when clicking the ui

[nsanden]

I have an html login form I want to present through blockui

How can i unblock the ui, when a user clicks the ui? In otherwords, if
the user decides they don't want to login after-all, instead of having
to click a cancel button, i want the option of being able to unlock it
by clicking anywhere outside the login form.

I tried variations of this but no success:

$("body").not("#form1").click(function() {
            $.unblockUI();
});