jQuery to hide a DIV when the user clicks outside of it.

hide-div-on-outside-click.js

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

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