// JavaScript Document

OpacityTween.prototype = new Tween();
OpacityTween.prototype.constructor = Tween;
OpacityTween.superclass = Tween.prototype;

function OpacityTween(obj,func,fromOpacity,toOpacity,duration){
	this.targetObject = obj;
	this.init(new Object(),'x',func,fromOpacity,toOpacity,duration);
}
var o = OpacityTween.prototype;
o.targetObject = {};
o.onMotionChanged = function(evt){
	var v = evt.target._pos;
	var t = this.targetObject;
	t.style['opacity'] = v / 100;
	t.style['-moz-opacity'] = v / 100;
	if(t.filters) t.filters.alpha['opacity'] = v;
}


//helps initiate all functions on window load

function addLoadEvent(func){
	var oldonload=window.onload;
	if(typeof window.onload !='function'){
		window.onload=func;
	}
	else{
		window.onload=function(){
			oldonload();
			func();
		}
	}
}

//initiates opacity on window load

window.onload = function(){
opacityTween = new OpacityTween(document.getElementById('leftimg'),Tween.bounceEaseOut, 0, 100, 7);
opacityTween.start();
}

addLoadEvent(opacity);