jQuery.extend({	

	/**

	 *

	 * @param Integer p period step in animation

	 * @param Integer n current time

	 * @param Mixed firstNum begin value

	 * @param Mixed delta change in

	 * @param Integer duration duration

	 */

	easing :  {

		linear: function(p, n, firstNum, delta, duration) {

			return ((-Math.cos(p*Math.PI)/2) + 0.5) * delta + firstNum;

		},

		

		easein: function(p, n, firstNum, delta, duration) {

			return delta*(n/=duration)*n*n + firstNum;

		},

		

		easeout: function(p, n, firstNum, delta, duration) {

			return -delta * ((n=n/duration-1)*n*n*n - 1) + firstNum;

		},

		

		easeboth: function(p, n, firstNum, delta, duration) {

			if ((n/=duration/2) < 1)

				return delta/2*n*n*n*n + firstNum;

				return -delta/2 * ((n-=2)*n*n*n - 2) + firstNum;

		},

		

		bounceout: function(p, n, firstNum, delta, duration) {

			if ((n/=duration) < (1/2.75)) {

				return delta*(7.5625*n*n) + firstNum;

			} else if (n < (2/2.75)) {

				return delta*(7.5625*(n-=(1.5/2.75))*n + .75) + firstNum;

			} else if (n < (2.5/2.75)) {

				return delta*(7.5625*(n-=(2.25/2.75))*n + .9375) + firstNum;

			} else {

				return delta*(7.5625*(n-=(2.625/2.75))*n + .984375) + firstNum;

			}

		},

		

		bouncein: function(p, n, firstNum, delta, duration) {

			if (jQuery.easing.bounceout)

				return delta - jQuery.easing.bounceout (p, duration - n, 0, delta, duration) + firstNum;

			return firstNum + delta;

		},

		

		bounceboth: function(p, n, firstNum, delta, duration) {

			if (jQuery.easing.bouncein && jQuery.easing.bounceout)

				if (n < duration/2)

					return jQuery.easing.bouncein(p, n*2, 0, delta, duration) * .5 + firstNum;

				return jQuery.easing.bounceout(p, n*2-duration, 0, delta, duration) * .5 + delta*.5 + firstNum; 

			return firstNum + delta;

		},

		

		elasticin: function(p, n, firstNum, delta, duration) {

			var a, s;

   			if (n == 0)

   				return firstNum;

   			if ((n/=duration)==1)

   				return firstNum+delta;

   			a = delta * 0.3;

   			p=duration*.3;

			if (a < Math.abs(delta)) {

				a=delta;

				s=p/4;

			} else { 

				s = p/(2*Math.PI) * Math.asin (delta/a);

			}

			return -(a*Math.pow(2,10*(n-=1)) * Math.sin( (n*duration-s)*(2*Math.PI)/p )) + firstNum; 

		},

		

		elasticout:function(p, n, firstNum, delta, duration) {

			var a, s;

			if (n==0)

				return firstNum;

			if ((n/=duration/2)==2)

				return firstNum + delta;

   			a = delta * 0.3;

   			p=duration*.3;

			if (a < Math.abs(delta)){

				a = delta;

				s=p/4;

			} else { 

				s = p/(2*Math.PI) * Math.asin (delta/a);

			}

			return a*Math.pow(2,-10*n) * Math.sin( (n*duration-s)*(2*Math.PI)/p ) + delta + firstNum;

		},

		

		elasticboth: function(p, n, firstNum, delta, duration) {

			var a, s;

			if (n==0)

				return firstNum;

			if ((n/=duration/2)==2)

				return firstNum + delta;

   			a = delta * 0.3;

   			p=duration*.3;

			if (a < Math.abs(delta)){

				a = delta;

				s=p/4;

			} else { 

				s = p/(2*Math.PI) * Math.asin (delta/a);

			}

			if (n < 1) {

				return -.5*(a*Math.pow(2,10*(n-=1)) * Math.sin( (n*duration-s)*(2*Math.PI)/p )) + firstNum;

			}

			return a*Math.pow(2,-10*(n-=1)) * Math.sin( (n*duration-s)*(2*Math.PI)/p )*.5 + delta + firstNum; 

		}

	}

});