function isParent (obj,parentObj){

    while (obj != undefined && obj != null && obj.tagName.toUpperCase() != 'BODY'){

        if (obj == parentObj){

            return true;

        }

        obj = obj.parentNode;

    }

    return false;

}

$(document).click(function(event){

    alert(isParent(event.target, $(".floatLayer")[0]));

});