/*
Easing Equations v1.5
May 1, 2003
(c) 2003 Robert Penner, all rights reserved. 
This work is subject to the terms in http://www.robertpenner.com/easing_terms_of_use.html. 
http://www.robertpenner.com/profmx
http://www.amazon.com/exec/obidos/ASIN/0072223561/robertpennerc-20
*/
Math.linearTween = function (t, b, c, d) 
{
	return c*t/d + b;
};
Math.easeInQuad = function (t, b, c, d) 
{
	return c*(t/=d)*t + b;
};
Math.easeOutQuad = function (t, b, c, d) 
{
	return -c *(t/=d)*(t-2) + b;
};
Math.easeInOutQuad = function (t, b, c, d) 
{
	if ((t/=d/2) < 1) return c/2*t*t + b;
	return -c/2 * ((--t)*(t-2) - 1) + b;
};
Math.easeInCubic = function (t, b, c, d) 
{
	return c*(t/=d)*t*t + b;
};
Math.easeOutCubic = function (t, b, c, d) 
{
	return c*((t=t/d-1)*t*t + 1) + b;
};
Math.easeInOutCubic = 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;
};
Math.easeInQuart = function (t, b, c, d) 
{
	return c*(t/=d)*t*t*t + b;
};
Math.easeOutQuart = function (t, b, c, d) 
{
	return -c * ((t=t/d-1)*t*t*t - 1) + b;
};
Math.easeInOutQuart = 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;
};
Math.easeInQuint = function (t, b, c, d) 
{
	return c*(t/=d)*t*t*t*t + b;
};
Math.easeOutQuint = function (t, b, c, d) 
{
	return c*((t=t/d-1)*t*t*t*t + 1) + b;
};
Math.easeInOutQuint = 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;
};
Math.easeInSine = function (t, b, c, d) 
{
	return -c * Math.cos(t/d * (Math.PI/2)) + c + b;
};
Math.easeOutSine = function (t, b, c, d) 
{
	return c * Math.sin(t/d * (Math.PI/2)) + b;
};
Math.easeInOutSine = function (t, b, c, d) 
{
	return -c/2 * (Math.cos(Math.PI*t/d) - 1) + b;
};
Math.easeInExpo = function (t, b, c, d) 
{
	return (t==0) ? b : c * Math.pow(2, 10 * (t/d - 1)) + b;
};
Math.easeOutExpo = function (t, b, c, d) 
{
	return (t==d) ? b+c : c * (-Math.pow(2, -10 * t/d) + 1) + b;
};
Math.easeInOutExpo = 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;
};
Math.easeInCirc = function (t, b, c, d) 
{
	return -c * (Math.sqrt(1 - (t/=d)*t) - 1) + b;
};
Math.easeOutCirc = function (t, b, c, d) 
{
	return c * Math.sqrt(1 - (t=t/d-1)*t) + b;
};
Math.easeInOutCirc = 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;
};
Math.easeInElastic = 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 < 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;
};
Math.easeOutElastic = 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 < 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;
};
Math.easeInOutElastic = 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 < 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;
};
Math.easeInBack = function (t, b, c, d, s) 
{
	if (s == undefined) s = 1.70158;
	return c*(t/=d)*t*((s+1)*t - s) + b;
};
Math.easeOutBack = 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;
};
Math.easeInOutBack = 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;
};
Math.easeInBounce = function (t, b, c, d) 
{
	return c - Math.easeOutBounce (d-t, 0, c, d) + b;
};
Math.easeOutBounce = 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;
	}
};
Math.easeInOutBounce = function (t, b, c, d) 
{
	if (t < d/2) return Math.easeInBounce (t*2, 0, c, d) * .5 + b;
	return Math.easeOutBounce (t*2-d, 0, c, d) * .5 + c*.5 + b;
};