http://stackoverflow.com/questions/1403615/use-jquery-to-hide-a-div-when-the-user-clicks-outside-of-it/7385673#7385673

Outside events

$(document).mouseup(function (e)
{
    var container = $("YOUR CONTAINER SELECTOR");

    if (!container.is(e.target) // if the target of the click isn't the container...
        && container.has(e.target).length === 0) // ... nor a descendant of the container
    {
        container.hide();
    }
});

Consider binding and unbinding this so it only listens when the pop is open