Easing = {

easeNone: function (t, b, c, d) {
	return c*t/d + b;
},


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;
},


easeBoth: function (t, b, c, d) {
	if ((t/=d/2) < 1) {
		return c/2*t*t + b;
	}
	
	return -c/2 * ((--t)*(t-2) - 1) + b;
},


easeInStrong: function (t, b, c, d) {
	return c*(t/=d)*t*t*t + b;
},


easeOutStrong: function (t, b, c, d) {
	return -c * ((t=t/d-1)*t*t*t - 1) + b;
},


easeBothStrong: 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;
},


elasticIn: 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;
},


elasticOut: 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;
},


elasticBoth: 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;
},



backIn: function (t, b, c, d, s) {
	if (typeof s == 'undefined') {
		s = 1.70158;
	}
	return c*(t/=d)*t*((s+1)*t - s) + b;
},


backOut: function (t, b, c, d, s) {
	if (typeof s == 'undefined') {
		s = 1.70158;
	}
	return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;
},


backBoth: function (t, b, c, d, s) {
	if (typeof 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;
},


bounceIn: function (t, b, c, d) {
	return c - YAHOO.util.Easing.bounceOut(d-t, 0, c, d) + b;
},


bounceOut: 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;
	}
	return c*(7.5625*(t-=(2.625/2.75))*t + .984375) + b;
},


bounceBoth: function (t, b, c, d) {
	if (t < d/2) {
		return YAHOO.util.Easing.bounceIn(t*2, 0, c, d) * .5 + b;
	}
	return YAHOO.util.Easing.bounceOut(t*2-d, 0, c, d) * .5 + c*.5 + b;
}
};