function after(){
                dom.style[attr] = restore;
                fly(dom).afterFx(o);
            }
Highlights the Element by setting a color (applies to the background-color by default, but can be
changed using the "attr" config option) and then fading back to the original color. If no original
color is available, you should provide the "endColor" config option which will be cleared after the animation.
Usage:
<pre><code>
// default: highlight background to yellow
el.highlight();

// custom: highlight foreground text to blue for 2 seconds
el.highlight("0000ff", { attr: 'color', duration: 2 });

// common config options shown with default values
el.highlight("ffff9c", {
    attr: "background-color", //can be any valid CSS property (attribute) that supports a color value
    endColor: (current color) or "ffffff",
    easing: 'easeIn',
    duration: 1
});
</code></pre>
@param {String} color (optional) The highlight color. Should be a 6 char hex color without the leading # (defaults to yellow: 'ffff9c')
@param {Object} options (optional) Object literal with any of the Fx config options
@return {Ext.Element} The Element