Easing equations according to /* (c) GSGD - http://gsgd.co.uk/sandbox/jquery/easing */

gistfile1.js

var easings = {

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

      inQuad: function(t, b, c, d) {
        return c * (t /= d) * t + b;
      },
      outQuad: function(t, b, c, d) {
        return -c * (t /= d) * (t - 2) + b;
      },
      inOutQuad: function(t, b, c, d) {
        if((t /= d / 2) < 1) return c / 2 * t * t + b;
        return -c / 2 * ((--t) * (t - 2) - 1) + b;
      },
      inCubic: function(t, b, c, d) {
        return c * (t /= d) * t * t + b;
      },
      outCubic: function(t, b, c, d) {
        return c * ((t = t / d - 1) * t * t + 1) + b;
      },
      inOutCubic: 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;
      },
      inQuart: function(t, b, c, d) {
        return c * (t /= d) * t * t * t + b;
      },
      outQuart: function(t, b, c, d) {
        return -c * ((t = t / d - 1) * t * t * t - 1) + b;
      },
      inOutQuart: 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;
      },
      inQuint: function(t, b, c, d) {
        return c * (t /= d) * t * t * t * t + b;
      },
      outQuint: function(t, b, c, d) {
        return c * ((t = t / d - 1) * t * t * t * t + 1) + b;
      },
      inOutQuint: 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;
      },
      inSine: function(t, b, c, d) {
        return -c * Math.cos(t / d * (Math.PI / 2)) + c + b;
      },
      outSine: function(t, b, c, d) {
        return c * Math.sin(t / d * (Math.PI / 2)) + b;
      },
      inOutSine: function(t, b, c, d) {
        return -c / 2 * (Math.cos(Math.PI * t / d) - 1) + b;
      },
      inExpo: function(t, b, c, d) {
        return(t == 0) ? b : c * Math.pow(2, 10 * (t / d - 1)) + b;
      },
      outExpo: function(t, b, c, d) {
        return(t == d) ? b + c : c * (-Math.pow(2, -10 * t / d) + 1) + b;
      },
      inOutExpo: 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;
      },
      inCirc: function(t, b, c, d) {
        return -c * (Math.sqrt(1 - (t /= d) * t) - 1) + b;
      },
      outCirc: function(t, b, c, d) {
        return c * Math.sqrt(1 - (t = t / d - 1) * t) + b;
      },
      inOutCirc: 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;
      },
      inElastic: function(t, b, c, d) {
        var s = 1.70158;
        var p = 0;
        var a = c;
        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;
      },
      outElastic: function(t, b, c, d) {
        var s = 1.70158;
        var p = 0;
        var a = c;
        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;
      },
      inOutElastic: function(t, b, c, d) {
        var s = 1.70158;
        var p = 0;
        var a = c;
        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;
      },
      inBack: function(t, b, c, d, s) {
        if(s == undefined) s = 1.70158;
        return c * (t /= d) * t * ((s + 1) * t - s) + b;
      },
      outBack: 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;
      },
      inOutBack: 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;
      },
      inBounce: function(t, b, c, d) {
        return c - rr.math.ease.outBounce(d - t, 0, c, d) + b;
      },
      outBounce: 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;
        }
      },
      inOutBounce: function(t, b, c, d) {
        if(t < d / 2) return rr.math.ease.inBounce(t * 2, 0, c, d) * .5 + b;
        return rr.math.ease.outBounce(t * 2 - d, 0, c, d) * .5 + c * .5 + b;
      }
    }