//サイドメニュー(アコーディオン型)

var accordion = function () {
    var tm = sp = 5;

    function slider(n) {
        this.nm = n;
        this.arr = []
    }
    slider.prototype.init = function (t, c, k) {
        var a, h, s, l, i;
        a = document.getElementById(t);
        this.sl = k ? k : '';
        h = a.getElementsByTagName('dt');
        s = a.getElementsByTagName('dd');
        this.l = h.length;
        for (i = 0; i < this.l; i++) {
            var d = h[i];
            this.arr[i] = d;
            d.onclick = new Function(this.nm + '.pro(this)');
            if (c == i) {
                d.className = this.sl
            }
        }
        l = s.length;
        for (i = 0; i < l; i++) {
            var d = s[i];
            d.mh = d.offsetHeight;
            if (c != i) {
                d.style.height = 0;
                d.style.display = 'none'
            }
        }
    }
    slider.prototype.pro = function (d) {
        for (var i = 0; i < this.l; i++) {
            var h = this.arr[i],
                s = h.nextSibling;
            s = s.nodeType != 1 ? s.nextSibling : s;
            clearInterval(s.tm);
            if (h == d && s.style.display == 'none') {
                    s.style.display = '';
                    su(s, 1);
                    h.className = this.sl
                }
            else if (s.style.display == '') {
                    su(s, -1);
                    h.className = ''
                }
        }
    }

    function su(c, f) {
        c.tm = setInterval(function () {
            sl(c, f)
        }, tm)
    }

    function sl(c, f) {
        var h = c.offsetHeight,
            m = c.mh,
            d = f == 1 ? m - h : h;
        c.style.height = h + (Math.ceil(d / sp) * f) + 'px';
        c.style.opacity = h / m;
        c.style.filter = 'alpha(opacity=' + h * 100 / m + ')';
        if (f == 1 && h >= m) {
                clearInterval(c.tm)
            } else if (f != 1 && h == 1) {
                c.style.display = 'none';
                clearInterval(c.tm)
            }
    }
    return {
        slider: slider
    }
}();