$(document).ready(function() {
    var imglinks = $('.expandable img');
    for (var i = 0; i < imglinks.length; i++) {
        $(imglinks[i]).bind('click', getnavi);
        if ($(imglinks[i]).attr('alt') == 'current') {
            displaynavi(imglinks[i]);
        }
    }

    //displaynavi(imglinks[0]);

    function getnavi(event) {
        var t = event.target;
        displaynavi(t);
    }

    function displaynavi(o) {
        var expand = $(o).attr('src');
        var url = expand.substring(0, expand.indexOf('toggle'));
        var navi = $(o).parent().next();
        if ($(navi).is(':hidden')) {
            $(navi).slideDown();
            $(o).attr('src', url + 'toggle_minus.gif');
        }
        else {
            $(navi).slideUp();
            $(o).attr('src', url + 'toggle_plus.gif');
        }
    }
});