element.js

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     */
    clip : function(){
        if(!this.isClipped){
           this.isClipped = true;
           this.originalClip = {
               "o": this.getStyle("overflow"),
               "x": this.getStyle("overflow-x"),
               "y": this.getStyle("overflow-y")
           };
           this.setStyle("overflow", "hidden");
           this.setStyle("overflow-x", "hidden");
           this.setStyle("overflow-y", "hidden");
        }
        return this;
    },

    /**
     *  Return clipping (overflow) to original clipping before clip() was called
     * @return {Ext.Element} this
     */
    unclip : function(){
        if(this.isClipped){
            this.isClipped = false;
            var o = this.originalClip;
            if(o.o){this.setStyle("overflow", o.o);}
            if(o.x){this.setStyle("overflow-x", o.x);}
            if(o.y){this.setStyle("overflow-y", o.y);}
        }
        return this;
    },


    /**
     * Gets the x,y coordinates specified by the anchor position on the element.
     * @param {String} anchor (optional) The specified anchor position (defaults to "c").  See {@link #alignTo} for details on supported anchor positions.
     * @param {Object} size (optional) An object containing the size to use for calculating anchor position
     *                       {width: (target width), height: (target height)} (defaults to the element's current size)
     * @param {Boolean} local (optional) True to get the local (element top/left-relative) anchor position instead of page coordinates
     * @return {Array} [x, y] An array containing the element's x and y coordinates
     */
    getAnchorXY : function(anchor, local, s){
        //Passing a different size is useful for pre-calculating anchors,
        //especially for anchored animations that change the el size.

        var w, h, vp = false;
        if(!s){
            var d = this.dom;
            if(d == document.body || d == document){
                vp = true;
                w = D.getViewWidth(); h = D.getViewHeight();
            }else{
                w = this.getWidth(); h = this.getHeight();
            }
        }else{
            w = s.width;  h = s.height;
        }
        var x = 0, y = 0, r = Math.round;
        switch((anchor || "tl").toLowerCase()){
            case "c":
                x = r(w*.5);
                y = r(h*.5);
            break;
            case "t":
                x = r(w*.5);
                y = 0;
            break;
            case "l":
                x = 0;
                y = r(h*.5);
            break;
            case "r":
                x = w;
                y = r(h*.5);
            break;
            case "b":
                x = r(w*.5);
                y = h;
            break;
            case "tl":
                x = 0;
                y = 0;
            break;
            case "bl":
                x = 0;
                y = h;
            break;
            case "br":
                x = w;
                y = h;
            break;
            case "tr":
                x = w;
                y = 0;
            break;
        }
        if(local === true){
            return [x, y];
        }
        if(vp){
            var sc = this.getScroll();
            return [x + sc.left, y + sc.top];
        }
        //Add the element's offset xy
        var o = this.getXY();
        return [x+o[0], y+o[1]];
    },

    /**
     * Gets the x,y coordinates to align this element with another element. See {@link #alignTo} for more info on the
     * supported position values.
     * @param {String/HTMLElement/Ext.Element} element The element to align to.
     * @param {String} position The position to align to.
     * @param {Array} offsets (optional) Offset the positioning by [x, y]
     * @return {Array} [x, y]
     */
    getAlignToXY : function(el, p, o){
        el = Ext.get(el);
        var d = this.dom;
        if(!el.dom){
            throw "Element.alignTo with an element that doesn't exist";
        }
        var c = false; //constrain to viewport
        var p1 = "", p2 = "";
        o = o || [0,0];

        if(!p){
            p = "tl-bl";
        }else if(p == "?"){
            p = "tl-bl?";
        }else if(p.indexOf("-") == -1){
            p = "tl-" + p;
        }
        p = p.toLowerCase();
        var m = p.match(/^([a-z]+)-([a-z]+)(\?)?$/);
        if(!m){
           throw "Element.alignTo with an invalid alignment " + p;
        }
        p1 = m[1]; p2 = m[2]; c = !!m[3];

        //Subtract the aligned el's internal xy from the target's offset xy
        //plus custom offset to get the aligned el's new offset xy
        var a1 = this.getAnchorXY(p1, true);
        var a2 = el.getAnchorXY(p2, false);
        var x = a2[0] - a1[0] + o[0];
        var y = a2[1] - a1[1] + o[1];
        if(c){
            //constrain the aligned el to viewport if necessary
            var w = this.getWidth(), h = this.getHeight(), r = el.getRegion();
            // 5px of margin for ie
            var dw = D.getViewWidth()-5, dh = D.getViewHeight()-5;

            //If we are at a viewport boundary and the aligned el is anchored on a target border that is
            //perpendicular to the vp border, allow the aligned el to slide on that border,
            //otherwise swap the aligned el to the opposite border of the target.
            var p1y = p1.charAt(0), p1x = p1.charAt(p1.length-1);
           var p2y = p2.charAt(0), p2x = p2.charAt(p2.length-1);
           var swapY = ((p1y=="t" && p2y=="b") || (p1y=="b" && p2y=="t"));
           var swapX = ((p1x=="r" && p2x=="l") || (p1x=="l" && p2x=="r"));

           var doc = document;
           var scrollX = (doc.documentElement.scrollLeft || doc.body.scrollLeft || 0)+5;
           var scrollY = (doc.documentElement.scrollTop || doc.body.scrollTop || 0)+5;

           if((x+w) > dw + scrollX){
                x = swapX ? r.left-w : dw+scrollX-w;
            }
           if(x < scrollX){
               x = swapX ? r.right : scrollX;
           }
           if((y+h) > dh + scrollY){
                y = swapY ? r.top-h : dh+scrollY-h;
            }
           if (y < scrollY){
               y = swapY ? r.bottom : scrollY;
           }
        }
        return [x,y];
    },

    // private
    getConstrainToXY : function(){
        var os = {top:0, left:0, bottom:0, right: 0};

        return function(el, local, offsets){
            el = Ext.get(el);
            offsets = offsets ? Ext.applyIf(offsets, os) : os;

            var vw, vh, vx = 0, vy = 0;
            if(el.dom == document.body || el.dom == document){
                vw = Ext.lib.Dom.getViewWidth();
                vh = Ext.lib.Dom.getViewHeight();
            }else{
                vw = el.dom.clientWidth;
                vh = el.dom.clientHeight;
                if(!local){
                    var vxy = el.getXY();
                    vx = vxy[0];
                    vy = vxy[1];
                }
            }

            var s = el.getScroll();

            vx += offsets.left + s.left;
            vy += offsets.top + s.top;

            vw -= offsets.right;
            vh -= offsets.bottom;

            var vr = vx+vw;
            var vb = vy+vh;

            var xy = !local ? this.getXY() : [this.getLeft(true), this.getTop(true)];
            var x = xy[0], y = xy[1];
            var w = this.dom.offsetWidth, h = this.dom.offsetHeight;

            // only move it if it needs it
            var moved = false;

            // first validate right/bottom
            if((x + w) > vr){
                x = vr - w;
                moved = true;
            }
            if((y + h) > vb){
                y = vb - h;
                moved = true;
            }
            // then make sure top/left isn't negative
            if(x < vx){
                x = vx;
                moved = true;
            }
            if(y < vy){
                y = vy;
                moved = true;
            }
            return moved ? [x, y] : false;
        };
    }(),

    /**
     * Aligns this element with another element relative to the specified anchor points. If the other element is the
     * document it aligns it to the viewport.
     * The position parameter is optional, and can be specified in any one of the following formats:
     * <ul>
     *   <li><b>Blank</b>: Defaults to aligning the element's top-left corner to the target's bottom-left corner ("tl-bl").</li>
     *   <li><b>One anchor (deprecated)</b>: The passed anchor position is used as the target element's anchor point.
     *       The element being aligned will position its top-left corner (tl) to that point.  <i>This method has been
     *       deprecated in favor of the newer two anchor syntax below</i>.</li>
     *   <li><b>Two anchors</b>: If two values from the table below are passed separated by a dash, the first value is used as the
     *       element's anchor point, and the second value is used as the target's anchor point.</li>
     * </ul>
     * In addition to the anchor points, the position parameter also supports the "?" character.  If "?" is passed at the end of
     * the position string, the element will attempt to align as specified, but the position will be adjusted to constrain to
     * the viewport if necessary.  Note that the element being aligned might be swapped to align to a different position than
     * that specified in order to enforce the viewport constraints.
     * Following are all of the supported anchor positions:
<pre>
Value  Description
-----  -----------------------------
tl     The top left corner (default)
t      The center of the top edge
tr     The top right corner
l      The center of the left edge
c      In the center of the element
r      The center of the right edge
bl     The bottom left corner
b      The center of the bottom edge
br     The bottom right corner
</pre>
Example Usage:
<pre><code>
// align el to other-el using the default positioning ("tl-bl", non-constrained)
el.alignTo("other-el");

// align the top left corner of el with the top right corner of other-el (constrained to viewport)
el.alignTo("other-el", "tr?");

// align the bottom right corner of el with the center left edge of other-el
el.alignTo("other-el", "br-l?");

// align the center of el with the bottom left corner of other-el and
// adjust the x position by -6 pixels (and the y position by 0)
el.alignTo("other-el", "c-bl", [-6, 0]);
</code></pre>
     * @param {String/HTMLElement/Ext.Element} element The element to align to.
     * @param {String} position The position to align to.
     * @param {Array} offsets (optional) Offset the positioning by [x, y]
     * @param {Boolean/Object} animate (optional) true for the default animation or a standard Element animation config object
     * @return {Ext.Element} this
     */
    alignTo : function(element, position, offsets, animate){
        var xy = this.getAlignToXY(element, position, offsets);
        this.setXY(xy, this.preanim(arguments, 3));
        return this;
    },

    /**
     * Anchors an element to another element and realigns it when the window is resized.
     * @param {String/HTMLElement/Ext.Element} element The element to align to.
     * @param {String} position The position to align to.
     * @param {Array} offsets (optional) Offset the positioning by [x, y]
     * @param {Boolean/Object} animate (optional) True for the default animation or a standard Element animation config object
     * @param {Boolean/Number} monitorScroll (optional) True to monitor body scroll and reposition. If this parameter
     * is a number, it is used as the buffer delay (defaults to 50ms).
     * @param {Function} callback The function to call after the animation finishes
     * @return {Ext.Element} this
     */
    anchorTo : function(el, alignment, offsets, animate, monitorScroll, callback){
        var action = function(){
            this.alignTo(el, alignment, offsets, animate);
            Ext.callback(callback, this);
        };
        Ext.EventManager.onWindowResize(action, this);
        var tm = typeof monitorScroll;
        if(tm != 'undefined'){
            Ext.EventManager.on(window, 'scroll', action, this,
                {buffer: tm == 'number' ? monitorScroll : 50});
        }
        action.call(this); // align immediately
        return this;
    },
    /**
     * Clears any opacity settings from this element. Required in some cases for IE.
     * @return {Ext.Element} this
     */
    clearOpacity : function(){
        if (window.ActiveXObject) {
            if(typeof this.dom.style.filter == 'string' && (/alpha/i).test(this.dom.style.filter)){
                this.dom.style.filter = "";
            }
        } else {
            this.dom.style.opacity = "";
            this.dom.style["-moz-opacity"] = "";
            this.dom.style["-khtml-opacity"] = "";
        }
        return this;
    },

    /**
     * Hide this element - Uses display mode to determine whether to use "display" or "visibility". See {@link #setVisible}.
     * @param {Boolean/Object} animate (optional) true for the default an