var menu = function() {
	var t = 15, s = 6, a;
	var z = 50; // z-index
	function dd(n) {
		this.n = n;
		this.h = [];
		this.c = [];
	}

	dd.prototype.init = function(p,c) {
		a = c;
		var w = document.getElementById(p), s = w.getElementsByTagName('ul'), l = s.length, i = 0;
		for (i; i < l; i++) {
			var h = s[i].parentNode;
			this.h[i] = h;
			this.c[i] = s[i];
			h.onmouseover = new Function(this.n + '.st(' + i + ',true)');
			h.onmouseout = new Function(this.n + '.st(' + i + ')');
		}
	}

	dd.prototype.st = function(x,f) {
		var c = this.c[x], h = this.h[x], p = h.getElementsByTagName('a')[0];
		clearInterval(c.t);
		c.style.overflow = 'hidden';
		if (f) {
			p.className += ' ' + a;
			if (!c.mh) {
				c.style.display = 'block';
				c.style.height = '';
				c.mh = c.offsetHeight;
				c.style.height = 0;
			}
			if (c.mh == c.offsetHeight) {
				c.style.overflow = 'visible'
			} else {
				c.style.zIndex = z;
				z++;
				c.t = setInterval(function(){sl(c, 1)}, t)};
		} else {
			p.className = p.className.replace(a, '');
			c.t = setInterval(function(){sl(c, -1)}, t)};
	}

	function sl(c,f) {
		var h = c.offsetHeight;
		if ((h <= 0 && f != 1) || (h >= c.mh && f == 1)) {
			if (f == 1) {
				c.style.filter = '';
				c.style.opacity = 1;
				c.style.overflow = 'visible';
			}
			clearInterval(c.t);
			return;
		}
		var d = (f == 1) ? Math.ceil((c.mh - h) / s) : Math.ceil(h / s), o = h / c.mh;
		c.style.opacity = o;
		c.style.filter = 'alpha(opacity=' + (o * 100) + ')';
		c.style.height = h + (d * f) + 'px';
	}

	return{dd:dd};
}();