jQuery - div that i slide down jumps back up! :(

[Tom Brokaw]

after i click my link(#advanced) to slide down my form(#form) my div slides down.. but then keeps jumping back up to its original location. this doesn't happen when i remove the .slideDown method though. what am i missing? any help is appreciated. thanks!

$(document).ready(function() {
$("#advanced").click(function(){
$("#form").height(200).slideDown("normal");
});
});

[jimfraser]

A wild guess...
return false;