/**
		t = elapsed time (ms)
		b = begin value
		c = difference (between begin value and end value)
		d = duration (ms)

		a,p = used for ELASTIC
		  s = used for BACK
	*/

	// LINEAR
	Math.easeNone = function(t, b, c, d) { return c * t/ d + b; }
	Math.easeIn = function(t, b, c, d) { return c * t / d + b; }
	Math.easeOut = function(t, b, c, d) { return c * t / d + b; }
	Math.easeInOut = function(t, b, c, d) { return c * t / d + b; }

	// QUAD
	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;
	}

	// CUBIC
	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;
	}

	// QUART
	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;
	}

	// QUINT
	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;
	}

	// EXPO
	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;
	}

	// SINE
	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; }

	// CIRC
	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;
	}

	// BACK
	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;
	}

	// ELASTIC
	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 || 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 || 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 || 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;
	}

	// BOUNCE
	Math.easeInBounce = 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.easeOutBounce = function(t, b, c, d) { return c - Math.easeOut(d-t, 0, c, d) + b; }
	Math.easeInOutBounce = function(t, b, c, d)
	{
		if (t < d/2)
			return Math.easeIn(t * 2, 0, c, d) * .5 + b;
		else
			return Math.easeOut(t * 2 - d, 0, c, d) * .5 + c * .5 + b;
	}