You're talking DHTML, my friend. IE4+ and NS6 only...<BR><BR>But you can get most the information from various HTML sites. I think htmlgoodies.com has some, as does DynamicDrive... They'll have some information for you, anyway.
Do a search for the dynamicselect.inc file...most places that have it also have a tutorial
Why NN6 only? I've done exactly what he's asking in NN4+.<BR><BR>Poster:<BR><BR>Check out http://www.irt.org