You can find any other answer element(other than the one targeted by clicked member element) which is visible and hide them
$(document).ready(function () {
var $answers = $('.answer');
$(".member").click(function () {
var $ans = $(this).next(".answer").stop(true).slideToggle(100);
$answers.not($ans).filter(':visible').stop(true).slideUp();
})
});
Demo: Fiddle