$(document).ready(function() {
    $('.expander .details').hide();
    $('.expander .expanderLink').bind('click', function() {
        var curElm = $(this);
        var expanderDiv = curElm.parents('.expander');
        if (!expanderDiv.children('.details').hasClass('open')) {
            expanderDiv.children('.details').show();
            expanderDiv.children('.details').addClass('open');
        } else {
            expanderDiv.children('.details').hide();
            expanderDiv.children('.details').removeClass('open');
        }
        return false;
    });
});