$(document).ready(function() {
    $('#staff ul li img').click(function() {
        if ($(this).hasClass('selectedStaff')){
            /* ignore, this one is already selected */
        } else {
            $('.staffinfo').addClass('hidestaffinfo');
            $('#' + this.className).removeClass('hidestaffinfo');
            $('#staff ul li img.selectedStaff').removeClass('selectedStaff');
            $(this).addClass('selectedStaff');
        }
    });
});