[jQuery] Another Slide Effect?

(hope this time the posting works)
hi.
recently i transfered to jQuery from mootools. some time ago i made a
slide-down div with mootools and wanted to get a similar effect with
jQuery.
example: www.madison.at -> click on login!
is there a way or a plugin in jQuery, to get the whole box slide down
at once instead of slide down part by part?
thanks in advance.
best.
c.