//by Valerio Proietti (http://mad4milk.net). MIT-style license.
//moo.fx.utils.js - depends on prototype.js OR prototype.lite.js + moo.fx.js
//version 2.0
Fx.Height=Class.create();Fx.Height.prototype=Object.extend(new Fx.Base(),{initialize:function(b,a){this.element=$(b);this.setOptions(a);this.element.style.overflow="hidden"},toggle:function(){if(this.element.offsetHeight>0){return this.custom(this.element.offsetHeight,0)}else{return this.custom(0,this.element.scrollHeight)}},show:function(){return this.set(this.element.scrollHeight)},increase:function(){this.setStyle(this.element,"height",this.now)}});Fx.Width=Class.create();Fx.Width.prototype=Object.extend(new Fx.Base(),{initialize:function(b,a){this.element=$(b);this.setOptions(a);this.element.style.overflow="hidden";this.iniWidth=this.element.offsetWidth},toggle:function(){if(this.element.offsetWidth>0){return this.custom(this.element.offsetWidth,0)}else{return this.custom(0,this.iniWidth)}},show:function(){return this.set(this.iniWidth)},increase:function(){this.setStyle(this.element,"width",this.now)}});Fx.Opacity=Class.create();Fx.Opacity.prototype=Object.extend(new Fx.Base(),{initialize:function(b,a){this.element=$(b);this.setOptions(a);this.now=1},toggle:function(){if(this.now>0){return this.custom(1,0)}else{return this.custom(0,1)}},show:function(){return this.set(1)},increase:function(){this.setStyle(this.element,"opacity",this.now)}});