You'd normally do this sort of thing by checking if the click occured inside the element or not, not by using mousemove events to set globals :
$(document).on('click', function(e) {
if ( !$(e.target).closest('#login_box').length ) { //not inside
var login_box = $('#login_box');
if ( parseInt(login_box.css('margin-top'),10) === 0){
login_box.stop(true, true).animate({"margin-top": "-=320px"}, "slow");
}
}
});
And live()
is deprecated, you should be using on()
.