The source code

    /**
     * @class Ext.Element
     */
    Ext.Element.addMethods({
        /**
         * Scrolls this element the specified scroll point. It does NOT do bounds checking so if you scroll to a weird value it will try to do it. For auto bounds checking, use scroll().
         * @param {String} side Either "left" for scrollLeft values or "top" for scrollTop values.
         * @param {Number} value The new scroll value
         * @param {Boolean/Object} animate (optional) true for the default animation or a standard Element animation config object
         * @return {Element} this
         */
        scrollTo : function(side, value, animate) {
            //check if we're scrolling top or left
            var top = /top/i.test(side),
                me = this,
                dom = me.dom,
                prop;
            if (!animate || !me.anim) {
                // just setting the value, so grab the direction
                prop = 'scroll' + (top ? 'Top' : 'Left');
                dom[prop] = value;
            }
            else {
                // if scrolling top, we need to grab scrollLeft, if left, scrollTop
                prop = 'scroll' + (top ? 'Left' : 'Top');
                me.anim({scroll: {to: top ? [dom[prop], value] : [value, dom[prop]]}}, me.preanim(arguments, 2), 'scroll');
            }
            return me;
        },

        /**
         * Scrolls this element into view within the passed container.
         * @param {Mixed} container (optional) The container element to scroll (defaults to document.body).  Should be a
         * string (id), dom node, or Ext.Element.
         * @param {Boolean} hscroll (optional) False to disable horizontal scroll (defaults to true)
         * @return {Ext.Element} this
         */
        scrollIntoView : function(container, hscroll) {
            var c = Ext.getDom(container) || Ext.getBody().dom,
                el = this.dom,
                o = this.getOffsetsTo(c),
                l = o[0] + c.scrollLeft,
                t = o[1] + c.scrollTop,
                b = t + el.offsetHeight,
                r = l + el.offsetWidth,
                ch = c.clientHeight,
                ct = parseInt(c.scrollTop, 10),
                cl = parseInt(c.scrollLeft, 10),
                cb = ct + ch,
                cr = cl + c.clientWidth;

            if (el.offsetHeight > ch || t < ct) {
                c.scrollTop = t;
            }
            else if (b > cb) {
                c.scrollTop = b-ch;
            }
            // corrects IE, other browsers will ignore
            c.scrollTop = c.scrollTop;

            if (hscroll !== false) {
                if (el.offsetWidth > c.clientWidth || l < cl) {
                    c.scrollLeft = l;
                }
                else if (r > cr) {
                    c.scrollLeft = r - c.clientWidth;
                }
                c.scrollLeft = c.scrollLeft;
            }
            return this;
        },

        // private
        scrollChildIntoView : function(child, hscroll) {
            Ext.fly(child, '_scrollChildIntoView').scrollIntoView(this, hscroll);
        },

        /**
         * Scrolls this element the specified direction. Does bounds checking to make sure the scroll is
         * within this element's scrollable range.
         * @param {String} direction Possible values are: "l" (or "left"), "r" (or "right"), "t" (or "top", or "up"), "b" (or "bottom", or "down").
         * @param {Number} distance How far to scroll the element in pixels
         * @param {Boolean/Object} animate (optional) true for the default animation or a standard Element animation config object
         * @return {Boolean} Returns true if a scroll was triggered or false if the element
         * was scrolled as far as it could go.
         */
         scroll : function(direction, distance, animate) {
            if (!this.isScrollable()) {
                return false;
            }
            var el = this.dom,
                l = el.scrollLeft, t = el.scrollTop,
                w = el.scrollWidth, h = el.scrollHeight,
                cw = el.clientWidth, ch = el.clientHeight,
                scrolled = false, v,
                hash = {
                    l: Math.min(l + distance, w-cw),
                    r: v = Math.max(l - distance, 0),
                    t: Math.max(t - distance, 0),
                    b: Math.min(t + distance, h-ch)
                };
                hash.d = hash.b;
                hash.u = hash.t;

            direction = direction.substr(0, 1);
            if ((v = hash[direction]) > -1) {
                scrolled = true;
                this.scrollTo(direction == 'l' || direction == 'r' ? 'left' : 'top', v, this.preanim(arguments, 2));
            }
            return scrolled;
        }
    });