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);}