[рони]

var value = '↕413↕6323↕63552↕';
value = del(value, 6323);
alert(value);
value = del(value, 63552);
alert(value);
value = del(value, 413);
alert(value);

function del(Str, Sub) {
    return Str = Str.replace('↕' + Sub + '↕', '↕').replace(/^↕$/, '')
};