var fx = new Object();
fx.Base = function(){};
fx.Base.prototype = {
setOptions: function(options) {
this.options = {duration: 500,
onComplete: '',
transition: fx.sinoidal}
Object.extend(this.options, options || {});},
step: function() {var time  = (new Date).getTime();
if (time >= this.options.duration+this.startTime) {
this.now = this.to;
clearInterval (this.timer);
this.timer = null;
if (this.options.onComplete) setTimeout(this.options.onComplete.bind(this), 10);}
else {
var Tpos = (time - this.startTime) / (this.options.duration);
this.now = this.options.transition(Tpos) * (this.to-this.from) + this.from;}
this.increase();},
custom: function(from, to) {
if (this.timer != null) return;
this.from = from;
this.to = to;
this.startTime = (new Date).getTime();
this.timer = setInterval (this.step.bind(this), 13);},
hide: function() {
this.now = 0;
this.increase();},
clearTimer: function() {
clearInterval(this.timer);
this.timer = null;}}
fx.Layout = Class.create();
fx.Layout.prototype = Object.extend(new fx.Base(), {
initialize: function(el, options) {
this.el = $(el);
this.el.style.overflow = "hidden";
this.iniWidth = this.el.offsetWidth;
this.iniHeight = this.el.offsetHeight;
this.setOptions(options);}});
fx.Height = Class.create();
Object.extend(Object.extend(fx.Height.prototype, fx.Layout.prototype), {	
increase: function() {
this.el.style.height = this.now + "px";},
toggle: function() {
if (this.el.offsetHeight > 0) this.custom(this.el.offsetHeight, 0);
else this.custom(0, this.el.scrollHeight);}});
fx.Width = Class.create();
Object.extend(Object.extend(fx.Width.prototype, fx.Layout.prototype), {	
increase: function() {
this.el.style.width = this.now + "px";},
toggle: function(){
if (this.el.offsetWidth > 0) this.custom(this.el.offsetWidth, 0);
else this.custom(0, this.iniWidth);}});
fx.Opacity = Class.create();
fx.Opacity.prototype = Object.extend(new fx.Base(), {
initialize: function(el, options) {
this.el = $(el);
this.now = 1;
this.increase();
this.setOptions(options);},
increase: function() {
if (this.now == 1 && (/Firefox/.test(navigator.userAgent))) this.now = 0.9999;
this.setOpacity(this.now);},
setOpacity: function(opacity) {
if (opacity == 0 && this.el.style.visibility != "hidden") this.el.style.visibility = "hidden";
else if (this.el.style.visibility != "visible") this.el.style.visibility = "visible";
if (window.ActiveXObject) this.el.style.filter = "alpha(opacity=" + opacity*100 + ")";
this.el.style.opacity = opacity;},
toggle: function() {if (this.now > 0) this.custom(1, 0);else this.custom(0, 1);}});
fx.sinoidal = function(pos){
return ((-Math.cos(pos*Math.PI)/2) + 0.5);}
fx.linear = function(pos){return pos;}
fx.cubic = function(pos){return Math.pow(pos, 3);}
fx.circ = function(pos){return Math.sqrt(pos);}