[jQuery] Issue: slideDown & height:auto

[jQuery] Issue: slideDown & height:auto

I'm having an issue with the effects library. This may be an issue
with moofx rather than jQuery implementation of it, so let me know if
I should contact moofx instead.
Anyway, the problem has to do with hight and width preservation after
the slide up/down or hide/show happens. If those values are a fixed
size, this works as expected. My boxes require that they are both set
to 'auto' after the show or slide down. It seems moofx is setting
them to be whatever hight the element was on the first collapse. The
problem is that the box expands and shrinks as the user resizes the
window with the setting of auto. Once the script is run the box has a
fixed height and the content overflows hidden. When the window is
resized down again, the content gets clipped.
I tried setting the height to auto again after the effect is
declared, but that didn't work. Perhaps it needs to call after the
script is done resizing. Is there a way I can set the height back to
auto after the end of the slideDown effect? I found an onComplete
option in the moofx library, but I don't know how to implement this
with jQuery's version of it.
Another curious thing, when querying the style.height of the element,
it always comes back as undefined. I wonder how the height is being
set by any other means...
Thanks,
Christian
PS: this is the code:
$(document).ready(function(){
    $("div.secTitleContainer")
    .prepend('<a href="javascript:void(0);" class="closeBoxButton"></a>')
    .find("a")
    .toggle(function(){
        this.blur();
        $(this).addClass("openBoxButton").removeClass("closeBoxButton");
        $("../../../../div:last",this).slideUp("fast");
    },function(){
        this.blur();
        $(this).addClass("closeBoxButton").removeClass("openBoxButton");
        $("../../../../div:last",this).slideDown("fast");
    });
});
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