The following example contains custom latitude and longitude functions.

			function toRad(num) {return num * Math.PI / 180;}
			function toDeg(num) {return num * 180 / Math.PI;}
 
			function calcDistance(lat1, lon1, lat2, lon2) {
			var R = 6371; // Radius of the earth in km
			var dLat = (lat2 - lat1) * Math.PI / 180;  // deg2rad below
			var dLon = (lon2 - lon1) * Math.PI / 180;
			var a = 
			0.5 - Math.cos(dLat)/2 + 
			Math.cos(lat1 * Math.PI / 180) * Math.cos(lat2 * Math.PI / 180) * 
			(1 - Math.cos(dLon))/2;
 
			return R * 2 * Math.asin(Math.sqrt(a));
			}
 
			function calcBearing (lat1,lng1,lat2,lng2) 
			{
			var dLon = (lng2-lng1);
			var y = Math.sin(dLon) * Math.cos(lat2);
			var x = Math.cos(lat1)*Math.sin(lat2) - Math.sin(lat1)*Math.cos(lat2)*Math.cos(dLon);
			var brng = toDeg(Math.atan2(y, x));
			return 360 - ((brng + 360) % 360);
			}
 
			function calcSpeed(lat1,lon1,lat2,lon2,time1,time2)
			{
			var d = calcDistance(lat1,lon1,lat2,lon2);
			var time = dateParse(time2)-dateParse(time1);
			return d/(time/1000/60/60);
		}

The following example contains custom easing functions.

			easing =
			{
			// t: current time, b: begInnIng value, c: change In value, d: duration
 
			swing: function (t, b, c, d) {
			return easing[easeOutQuad](t, b, c, d);
			},
			easeInQuad: function (t, b, c, d) {
			return c*(t/=d)*t + b;
			},
			easeOutQuad: function (t, b, c, d) {
			return -c *(t/=d)*(t-2) + b;
			},
			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;
			},
			easeInCubic: function (t, b, c, d) {
			return c*(t/=d)*t*t + b;
			},
			easeOutCubic: function (t, b, c, d) {
			return c*((t=t/d-1)*t*t + 1) + b;
			},
			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;
			},
			easeInQuart: function (t, b, c, d) {
			return c*(t/=d)*t*t*t + b;
			},
			easeOutQuart: function (t, b, c, d) {
			return -c * ((t=t/d-1)*t*t*t - 1) + b;
			},
			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;
			},
			easeInQuint: function (t, b, c, d) {
			return c*(t/=d)*t*t*t*t + b;
			},
			easeOutQuint: function (t, b, c, d) {
			return c*((t=t/d-1)*t*t*t*t + 1) + b;
			},
			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;
			},
			easeInSine: function (t, b, c, d) {
			return -c * Math.cos(t/d * (Math.PI/2)) + c + b;
			},
			easeOutSine: function (t, b, c, d) {
			return c * Math.sin(t/d * (Math.PI/2)) + b;
			},
			easeInOutSine: function (t, b, c, d) {
			return -c/2 * (Math.cos(Math.PI*t/d) - 1) + b;
			},
			easeInExpo: function (t, b, c, d) {
			return (t==0) ? b : c * Math.pow(2, 10 * (t/d - 1)) + b;
			},
			easeOutExpo: function (t, b, c, d) {
			return (t==d) ? b+c : c * (-Math.pow(2, -10 * t/d) + 1) + b;
			},
			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;
			},
			easeInCirc: function (t, b, c, d) {
			return -c * (Math.sqrt(1 - (t/=d)*t) - 1) + b;
			},
			easeOutCirc: function (t, b, c, d) {
			return c * Math.sqrt(1 - (t=t/d-1)*t) + b;
			},
			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;
			},
			easeInElastic: 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;
			},
			easeOutElastic: 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;
			},
			easeInOutElastic: 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;
			},
			easeInBack: function (t, b, c, d, s) {
			if (s == undefined) s = 1.70158;
			return c*(t/=d)*t*((s+1)*t - s) + b;
			},
			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;
			},
			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;
			},
			easeInBounce: function (t, b, c, d) {
			return c - easing.easeOutBounce (d-t, 0, c, d) + b;
			},
			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;
			}
			},
			easeInOutBounce: function (t, b, c, d) {
			if (t < d/2) return easing.easeInBounce (t*2, 0, c, d) * .5 + b;
			return easing.easeOutBounce (t*2-d, 0, c, d) * .5 + c*.5 + b;
			}
			};
			return easing[@.a](0+@.b,0,1,1,0+@.e)*@.c+@.d;