Collapsible Navigation a good idea?

[Shiznaught]

I thinking of using a collapsible menu on a site im working on, but I'm worried about negative seo reprucussions. i'm only considering a 1 level type collapsible nav bar. any ideas or suggestions on a script that works well with search engines? thanks.

[tedster]

Any menu system where the visible html code is made of html elements (divs, lists, etc) and css ids/classes will work. It should inly use javascript to change the css display: rules for the elements -- not to define the location.href for the links and not use document.write to insert html. "Accordian menu" is the term I've heard used a lot, in addition to "collapsible".

I use this kind of menu in several cases and have no spidering/indexing troubles, nor would I expect any. The secondary menu items simply change from display:none to display:block (or vice versa) onclick, but the anchor tags have pure html href attributes.