[Moo] IE7 problem: Object doesn't support this property or method

[Anatol]

Hi,

I added a few simple Mootools effects to a web page. All works well in
Firefox, but (as expected) IE (tested in IE7) causes trouble for some
but not all of the script.

Here is a test page: http://dipl-o-matic.nugob.org/test-page

The relevant code is:
----------------------------------

//<![CDATA[
    window.addEvent('domready', function() {
        var scroll = new Scroller('timeline', { area:
Math.round((window.getWidth() - 760) / 2), velocity: 0.1 });
        scroll.start();

        $('searchform').fade('out');

        Element.implement({
            ShowHide: function() {
                this.setStyle('display','block');
                this.fade('toggle');
            }
        });

        var SlideInOut = new Fx.Slide('commentform', {
            duration: 1000,
            transition: Fx.Transitions.Pow.easeOut
        });

        SlideInOut.hide();

        Element.implement({
            Slide: function() {
                SlideInOut.toggle();
            }
        });

    });
//]]>

----------------------------------

When I click on "post your comment" on the page a comment form should
slide open/close. It works in Firefox but in IE7 I get the script
error:

----------------------------------
Line: 1
Character: 1
Code: 0
Error Message: Object doesn't support this property or method
URL: http://dipl-o-matic.nugob.org/test-page
----------------------------------

The same happens when I click on 'search' at the bottom of the page
which should fade in/out a search field. This also works in Firefox.

I'm not sure why this happens. I checked many forum posts and tried a
lot but to no avail. The HTML and CSS code seem to be standards
conform.

Another Mootools effect (the timeline at the bottom is a scroller)
works fine and also the initial hiding of the comment form seems to
work well.

Any hints are much appreciated. To me the error message doesn't say
very much.

Cheers!
Anatol