[jQuery] slideDown() incomplete

[jQuery] slideDown() incomplete

A weird thing on
http://blog.mondediplo.net/2006-09-02-Tous-unis-contre-le-fascisme-islamique
I have a script that opens the "archives / date" blocks when one clicks on
the date.
If I use
.slideDown('slow');
it doesn't slide down 100%, and stops at about 90% (on FF/Mac). I have to do
this to have it in full:
.slideDown('slow', function(){
$(this).height('');
});
And of course I don't like the idea.
The "show selection source" menu in FF tells me that the buggy code is:
<ul><li style="position: static;"><span style="">août 2006</span>
<ul style="overflow: visible; display: block; height: 294px;">
<li><a href="2006-08-31-Terrorisme">Terrorisme</a>
</li>
...
Any idea? (jquery-1.0.2)
-- Fil
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