// JavaScript Document

var get_id=function(id){
	if(typeof id =="string" )return document.getElementById(id) ? document.getElementById(id) : document.getElementsByName(id)
	else return id;
}

var add_event=function(obj,type,fun,boolean){
	window.addEventListener ? obj.addEventListener(type,fun,boolean) : obj.attachEvent("on"+type,fun);
}

var set_opacity=function(target,value){
	 target.filters ? target.filters[0].opacity=value : target.style.opacity=value/100; 
}
var get_opacity=function(target){
	return target.filters ? target.filters[0].opacity : target.style.opacity=value*100; 
}

//parameter:target:object,current_position:Number,end_position:Number,direction:String,type:object[buffer:string,ease:string,time:Numebr]
function Tween(target,c_position,e_position,direction,type)
{
	
	this.targets=target;
	this.end=e_position;
	this.endPosition=Math.abs(e_position-c_position)
	this.currentPosition=c_position;
	this.directions=direction;
	this.buffer=type.buffer ? type.buffer : false;
	this.ease=type.ease ? type.ease : false ;
	this.duration=type.time ? type.time : 100;
	this.formulas= !this.buffer ? Formula["Linear"] : (this.buffer && !this.ease ? Formula[this.buffer]["easeIn"] : Formula[this.buffer][this.ease]);
	this.monitor;
	this.timeout;
	this.record=0;
	this.addEvent;
	this.tt;

	if(typeof Tween.Initialized=="undefined")
	{

		Tween.prototype.start=function()
		{
			var self=this
			this.monitor=false;
			window.clearTimeout(this.timeout);
			this.timeout =window.setTimeout(function(){self.execution()},10);
		}

		Tween.prototype.execution=function()
		{
		   if(this.record<this.duration){
			  this.record++;
			  this.set_position(Math.ceil(this.formulas(this.record,0,this.endPosition,this.duration)));
			  this.start();
		   }else{
		      this.set_position(this.endPosition)
			  if(this.addEvent instanceof Function)this.addEvent()
		  }	 
	   }
	   
	   Tween.prototype.set_position=function(position){
		   switch(this.directions){
				 case "Y" :this.targets.style.top   = this.create_num(position)+"px";break;
				 case "X" :this.targets.style.left  = this.create_num(position)+"px";break;
				 case "W" :this.targets.style.width = this.create_num(position)+"px";break;
				 case "H" :this.targets.style.height= this.create_num(position)+"px";break;
				 case "A" : set_opacity(this.targets,this.create_num(position))     ;break;
		   } 
	   }
	   
	   Tween.prototype.create_num=function(position)
	   { 
		  return this.currentPosition<this.end ? this.currentPosition+position :  this.currentPosition-position;
	   }
   }
    Tween.Initialized=true;
}



var Formula= {
	Linear: function(t,b,c,d){ return c*t/d + b; },
	Quad: {
	  easeIn: function(t,b,c,d){ return c*(t/=d)*t + b;},
	  easeOut: function(t,b,c,d){return -c *(t/=d)*(t-2) + b;},
	  easeInOut: function(t,b,c,d){if ((t/=d/2) < 1) return c/2*t*t + b;
	  return -c/2 * ((--t)*(t-2) - 1) + b;}
	},
	Cubic: {
	  easeIn: function(t,b,c,d){return c*(t/=d)*t*t + b;},
	  easeOut: function(t,b,c,d){return c*((t=t/d-1)*t*t + 1) + b;},
	  easeInOut: function(t,b,c,d){if ((t/=d/2) < 1) return c/2*t*t*t + b;
	  return c/2*((t-=2)*t*t + 2) + b;}
	},
	Quart: {
	 easeIn: function(t,b,c,d){ return c*(t/=d)*t*t*t + b;},
	 easeOut: function(t,b,c,d){return -c * ((t=t/d-1)*t*t*t - 1) + b;},
	 easeInOut: function(t,b,c,d){if ((t/=d/2) < 1) return c/2*t*t*t*t + b;
	 return -c/2 * ((t-=2)*t*t*t - 2) + b;}
	},
	Quint: {
	easeIn: function(t,b,c,d){return c*(t/=d)*t*t*t*t + b;},
	easeOut: function(t,b,c,d){return c*((t=t/d-1)*t*t*t*t + 1) + b;},
	easeInOut: function(t,b,c,d){if ((t/=d/2) < 1) return c/2*t*t*t*t*t + b;
	return c/2*((t-=2)*t*t*t*t + 2) + b;}
	},
	Sine: {
	easeIn: function(t,b,c,d){return -c * Math.cos(t/d * (Math.PI/2)) + c + b;},
	easeOut: function(t,b,c,d){return c * Math.sin(t/d * (Math.PI/2)) + b;},
	easeInOut: function(t,b,c,d){return -c/2 * (Math.cos(Math.PI*t/d) - 1) + b;}
	},
	Expo: {
	easeIn: function(t,b,c,d){return (t==0) ? b : c * Math.pow(2, 10 * (t/d - 1)) + b;},
	easeOut: function(t,b,c,d){return (t==d) ? b+c : c * (-Math.pow(2, -10 * t/d) + 1) + b;},
	easeInOut: function(t,b,c,d){if (t==0) return b;if (t==d) return b+c;if ((t/=d/2) < 1) return c/2 * Math.pow(2, 10 * (t - 1)) + b; 
	return c/2 * (-Math.pow(2, -10 * --t) + 2) + b;}
	},
	Circ: {
	easeIn: function(t,b,c,d){return -c * (Math.sqrt(1 - (t/=d)*t) - 1) + b;},
	easeOut: function(t,b,c,d){return c * Math.sqrt(1 - (t=t/d-1)*t) + b;},
	easeInOut: function(t,b,c,d){if ((t/=d/2) < 1) return -c/2 * (Math.sqrt(1 - t*t) - 1) + b; 
	return c/2 * (Math.sqrt(1 - (t-=2)*t) + 1) + b;
	}
	},
	Elastic: {
	easeIn: function(t,b,c,d,a,p){if (t==0) return b;  if ((t/=d)==1) return b+c;  if (!p) p=d*.3;
	if (!a || a < Math.abs(c)) { a=c; var s=p/4; }
	 else var s = p/(2*Math.PI) * Math.asin (c/a);
	 return -(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
	},
	easeOut: function(t,b,c,d,a,p){
	 if (t==0) return b;  if ((t/=d)==1) return b+c;  if (!p) p=d*.3;
	 if (!a || a < Math.abs(c)) { a=c; var s=p/4; }
	 else var s = p/(2*Math.PI) * Math.asin (c/a);
	 return (a*Math.pow(2,-10*t) * Math.sin( (t*d-s)*(2*Math.PI)/p ) + c + b);
	},
	easeInOut: function(t,b,c,d,a,p){
	 if (t==0) return b;  if ((t/=d/2)==2) return b+c;  if (!p) p=d*(.3*1.5);
	 if (!a || a < Math.abs(c)) { a=c; var s=p/4; }
	 else var s = p/(2*Math.PI) * Math.asin (c/a);
	 if (t < 1) return -.5*(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
	 return a*Math.pow(2,-10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )*.5 + c + b;
	}
	},
	Back: {
	easeIn: function(t,b,c,d,s){
	 if (s == undefined) s = 1.70158;
	 return c*(t/=d)*t*((s+1)*t - s) + b;
	},
	easeOut: function(t,b,c,d,s){
	 if (s == undefined) s = 1.70158;
	 return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;
	},
	easeInOut: function(t,b,c,d,s){
	 if (s == undefined) s = 1.70158; 
	 if ((t/=d/2) < 1) return c/2*(t*t*(((s*=(1.525))+1)*t - s)) + b;
	 return c/2*((t-=2)*t*(((s*=(1.525))+1)*t + s) + 2) + b;
	}
	},
	Bounce: {
	easeIn: function(t,b,c,d){
	 return c - Formula.Bounce.easeOut(d-t, 0, c, d) + b;
	},
	easeOut: function(t,b,c,d){
	 if ((t/=d) < (1/2.75)) {return c*(7.5625*t*t) + b;} else if (t < (2/2.75)) { 
	 return c*(7.5625*(t-=(1.5/2.75))*t + .75) + b;
	 } else if (t < (2.5/2.75)) {
		 return c*(7.5625*(t-=(2.25/2.75))*t + .9375) + b;
	 } else {
	  return c*(7.5625*(t-=(2.625/2.75))*t + .984375) + b;}
	},
	easeInOut: function(t,b,c,d){
	 if (t < d/2) return Formula.Bounce.easeIn(t*2, 0, c, d) * .5 + b;
	 else return Formula.Bounce.easeOut(t*2-d, 0, c, d) * .5 + c*.5 + b; }
	}
}