The source code

    // Easing functions
    (function(){
    	// shortcuts to aid compression
    	var abs = Math.abs,
    	 	pi = Math.PI,
    	 	asin = Math.asin,
    	 	pow = Math.pow,
    	 	sin = Math.sin,
    		EXTLIB = Ext.lib;

        Ext.apply(EXTLIB.Easing, {

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

            elasticIn: function (t, b, c, d, a, p) {
    	        if (t == 0 || (t /= d) == 1) {
                    return t == 0 ? b : b + c;
                }
                p = p || (d * .3);

    			var s;
    			if (a >= abs(c)) {
    				s = p / (2 * pi) * asin(c / a);
    			} else {
    				a = c;
    				s = p / 4;
    			}

                return -(a * pow(2, 10 * (t -= 1)) * sin((t * d - s) * (2 * pi) / p)) + b;

            },

    		elasticOut: function (t, b, c, d, a, p) {
    	        if (t == 0 || (t /= d) == 1) {
                    return t == 0 ? b : b + c;
                }
                p = p || (d * .3);

    			var s;
    			if (a >= abs(c)) {
    				s = p / (2 * pi) * asin(c / a);
    			} else {
    				a = c;
    				s = p / 4;
    			}

                return a * pow(2, -10 * t) * sin((t * d - s) * (2 * pi) / p) + c + b;
            },

            elasticBoth: function (t, b, c, d, a, p) {
                if (t == 0 || (t /= d / 2) == 2) {
                    return t == 0 ? b : b + c;
                }

                p = p || (d * (.3 * 1.5));

                var s;
                if (a >= abs(c)) {
    	            s = p / (2 * pi) * asin(c / a);
                } else {
    	            a = c;
                    s = p / 4;
                }

                return t < 1 ?
                	   	-.5 * (a * pow(2, 10 * (t -= 1)) * sin((t * d - s) * (2 * pi) / p)) + b :
                        a * pow(2, -10 * (t -= 1)) * sin((t * d - s) * (2 * pi) / p) * .5 + c + b;
            },

            backIn: function (t, b, c, d, s) {
                s = s ||  1.70158;
                return c * (t /= d) * t * ((s + 1) * t - s) + b;
            },

            backOut: function (t, b, c, d, s) {
                if (!s) {
                    s = 1.70158;
                }
                return c * ((t = t / d - 1) * t * ((s + 1) * t + s) + 1) + b;
            },

            backBoth: function (t, b, c, d, s) {
                s = s || 1.70158;

                return ((t /= d / 2 ) < 1) ?
                        c / 2 * (t * t * (((s *= (1.525)) + 1) * t - s)) + b :
                		c / 2 * ((t -= 2) * t * (((s *= (1.525)) + 1) * t + s) + 2) + b;
            },

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

    (function() {
        var EXTLIB = Ext.lib;
    	// Color Animation
    	EXTLIB.Anim.color = function(el, args, duration, easing, cb, scope) {
    	    return EXTLIB.Anim.run(el, args, duration, easing, cb, scope, EXTLIB.ColorAnim);
    	}

        EXTLIB.ColorAnim = function(el, attributes, duration, method) {
            EXTLIB.ColorAnim.superclass.constructor.call(this, el, attributes, duration, method);
        };

        Ext.extend(EXTLIB.ColorAnim, EXTLIB.AnimBase);

        var superclass = EXTLIB.ColorAnim.superclass,
        	colorRE = /color$/i,
        	transparentRE = /^transparent|rgba\(0, 0, 0, 0\)$/,
            rgbRE = /^rgb\(([0-9]+)\s*,\s*([0-9]+)\s*,\s*([0-9]+)\)$/i,
            hexRE= /^#?([0-9A-F]{2})([0-9A-F]{2})([0-9A-F]{2})$/i,
            hex3RE = /^#?([0-9A-F]{1})([0-9A-F]{1})([0-9A-F]{1})$/i,
            isset = function(v){
                return typeof v !== 'undefined';
            }

       	// private
        function parseColor(s) {
            var pi = parseInt,
                base,
                out = null,
                c;

    	    if (s.length == 3) {
                return s;
            }

            Ext.each([hexRE, rgbRE, hex3RE], function(re, idx){
                base = (idx % 2 == 0) ? 16 : 10;
                c = re.exec(s);
                if(c && c.length == 4){
                    out = [pi(c[1], base), pi(c[2], base), pi(c[3], base)];
                    return false;
                }
            });
            return out;
        }

        Ext.apply(EXTLIB.ColorAnim.prototype, {
            getAttr : function(attr) {
                var me = this,
                    el = me.el,
                    val;
                if(colorRE.test(attr)){
                    while(el && transparentRE.test(val = Ext.fly(el).getStyle(attr))){
                        el = el.parentNode;
                        val = "fff";
                    }
                }else{
                    val = superclass.getAttr.call(me, attr);
                }
                return val;
            },

            doMethod : function(attr, start, end) {
                var me = this,
                	val,
                	floor = Math.floor;

                if(colorRE.test(attr)){
                    val = [];

    	            Ext.each(start, function(v, i) {
                        val[i] = superclass.doMethod.call(me, attr, v, end[i]);
                    });

                    val = 'rgb(' + floor(val[0]) + ',' + floor(val[1]) + ',' + floor(val[2]) + ')';
                }else{
                    val = superclass.doMethod.call(me, attr, start, end);
                }
                return val;
            },

            setRunAttr : function(attr) {
                var me = this,
                    a = me.attributes[attr],
                    to = a.to,
                    by = a.by,
                    ra;

                superclass.setRunAttr.call(me, attr);
                ra = me.runAttrs[attr];
                if(colorRE.test(attr)){
                    var start = parseColor(ra.start),
                        end = parseColor(ra.end);

                    if(!isset(to) && isset(by)){
                        end = parseColor(by);
                        Ext.each(start, function(item, i){
                            end[i] = item + end[i];
                        });
                    }
                    ra.start = start;
                    ra.end = end;
                }
            }
    	});
    })();

    (function() {
    	    // Scroll Animation
        var EXTLIB = Ext.lib;
    	EXTLIB.Anim.scroll = function(el, args, duration, easing, cb, scope) {
    	    return EXTLIB.Anim.run(el, args, duration, easing, cb, scope, EXTLIB.Scroll);
    	}

        EXTLIB.Scroll = function(el, attributes, duration, method) {
            if(el){
                EXTLIB.Scroll.superclass.constructor.call(this, el, attributes, duration, method);
            }
        };

        Ext.extend(EXTLIB.Scroll, EXTLIB.ColorAnim);

        var superclass = EXTLIB.Scroll.superclass,
        	SCROLL = 'scroll';

        Ext.apply(EXTLIB.Scroll.prototype, {

            doMethod : function(attr, start, end) {
                var val,
                	me = this,
                	curFrame = me.curFrame,
                	totalFrames = me.totalFrames;

                if(attr == SCROLL){
                    val = [me.method(curFrame, start[0], end[0] - start[0], totalFrames),
                           me.method(curFrame, start[1], end[1] - start[1], totalFrames)];
                }else{
                    val = superclass.doMethod.call(me, attr, start, end);
                }
                return val;
            },

            getAttr : function(attr) {
                var me = this;

                if (attr == SCROLL) {
                    return [me.el.scrollLeft, me.el.scrollTop];
                }else{
                    return superclass.getAttr.call(me, attr);
                }
            },

            setAttr : function(attr, val, unit) {
                var me = this;

                if(attr == SCROLL){
                    me.el.scrollLeft = val[0];
                    me.el.scrollTop = val[1];
                }else{
                    superclass.setAttr.call(me, attr, val, unit);
                }
            }
        });
    })();