JBOTs will write that kind of script automatically for you. Click the JBOTs link in the left column for more on that.

Here's a script you can use for this if you prefer to hand code. Remember to paste this script into notepad and then copy/paste fom notepad into FP html mode. Otherwise FP will think you want to display the code example on your web page.

http://dsolutions.hypermart.net/javascripts/drop_down.htm

Also when you have your script, the links should look like this "#compserv" instead of this "compservices.htm#compserv"