function Opacity(elem, oTimer){
	this.elem = elem;
	this.timer = Timer.detectTimer(oTimer);
	this.currentProcess = "fade";
	this.onafterfade = new DOMEvent();
	this.onafterappear = new DOMEvent();
	this.onchange = new DOMEvent();
	this.saveFloat = new Nums.SaveFloatPoint();
	this.step = 5;
	this.IS_DOING = false;
	this.init();

}
Opacity.prototype.init = function(){
	this.initTimer();
	if(Style._browser == "IE"){
		this.elem.style.zoom  = 1;
	}
	this.currentOpacity = Opacity.getOpacity(this.elem);
	this.currentVisibility = Opacity.getVisibility(this.elem);
}
Opacity.prototype.initTimer = function(){
	if(this.timer._MUTUAL){
		if(this.timer.registerOpacity){
			this.timer.registerOpacity(this);
		}else{
			Opacity.handleMutualTimer(this.timer);
			this.timer.registerOpacity(this);
		}
	}else{
		this.timer.registerEvent({
			name: "changer",
			func: this.change,
			oThis: this,
			args: []
		});
	}
}
Opacity.prototype.setOpacity = function(value){
	if(typeof value == "undefined" || value > 100 || value < 0)
		return false;
	value = this.saveFloat.add(value);
	var styleValue = Opacity.styleStartText + (value / Opacity.styleCoeff) + Opacity.styleEndText;
	Style.setElementStyle(this.elem, Opacity.styleProperty, styleValue);
	this.currentOpacity = value;
}
Opacity.prototype.setVisible = function(){
	Style.setElementStyle(this.elem, "visibility", "visible");
	this.currentVisibility = "visible";
}
Opacity.prototype.setHidden = function(){
	Style.setElementStyle(this.elem, "visibility", "hidden");
	this.currentVisibility = "hidden";
}
Opacity.prototype.fade = function(value, sVal){
	this.toValue = value ? value  : 0;
	this.currentProcess = "fade";
	this.step = sVal ? -Math.abs(sVal) : -Math.abs(this.step);
	this.IS_DOING = true;
	this.start();
}
Opacity.prototype.appear = function(value, sVal){
	this.toValue = value ? value : 100;
	this.currentProcess = "appear";
	this.step = sVal ? Math.abs(sVal) : Math.abs(this.step);
	this.start();
}
Opacity.prototype.change = function(){
	var stop = false;
	var nextVal = this.currentOpacity + this.step;
	if(this.currentProcess == "fade"){
		if(nextVal < this.toValue){
			nextVal = this.toValue;
			stop = true;
		}
	}else if(this.currentProcess == "appear"){
		if(nextVal > this.toValue){
			nextVal = this.toValue;
			stop = true;
		}
	}
	this.setOpacity(nextVal);
	this.onchange.fire();
	if(stop){
		this.stop();
		this["onafter" + this.currentProcess].fire();	
	}
}
Opacity.prototype.start = function(){
	this.IS_DOING = true;
	if(!this.timer._MUTUAL){
		this.timer.start();
	}
}
Opacity.prototype.stop = function(){
	this.IS_DOING = false;
	if(!this.timer._MUTUAL){
		this.timer.clear();
	}
}


Opacity.getOpacity = function(elem){
	var currentOpacity = Style.getElementStyle(elem, Opacity.styleProperty);
	if(currentOpacity == ''){
		currentOpacity = "100";
	}
	var re = new RegExp(" ", "ig");
	return Number(currentOpacity.replace(re, '').replace(Opacity.styleStartText, '').replace(Opacity.styleEndText, '')) * Opacity.styleCoeff;
}
Opacity.setDimensions = function(elem){
	with(Style){
		setElementStyle(elem, getDimensions(elem), null, true);
	}
}
Opacity.getVisibility = function(elem){
	return Style.getElementStyle(elem, 'visibility') == 'inherit' ? 'visible' : Style.getElementStyle(elem, 'visibility');
}
Opacity.NoGo = false;
Opacity.styleStartText = "";
Opacity.styleEndText = "";
Opacity.styleCoeff = 100;
Opacity.styleProperty = "opacity";
Opacity.slow = 3;
if(Style._browser == "IE"){
	Opacity.styleProperty = "filter";
	Opacity.styleCoeff = 1;
	Opacity.styleStartText = "alpha(opacity=";
	Opacity.styleEndText = ")";
	Opacity.slow = 1;
}else if(Style._browser == "Gecko" || Style._browser == "Opera"){
	//OK
}else{
	Opacity.NoGo = true;
}
Opacity.handleMutualTimer = function(oTimer){
	oTimer.opacities = [];
	oTimer.registerOpacity = function(op){
		this.opacities.push(op);
	}
	oTimer.registerEvent({
		name: "opacity",
		func: function(){
			this.opacities.each(function(op){
				if(op.IS_DOING){
					op.change();
				}
			})
		},
		oThis: oTimer,
		args: []
	})
}
Opacity.handleOwnTimer = function(oTimer){
}