I am only a casual Javascript user.

I need to present to the user a tree of "select/option" lists with 3 or 4 levels. Out of over 1,000 options the user will probably select between 1 and 3 options.

Can someone make suggestions on how to do this?

I do not mind doing it in HTML code using links unless advised otherwise. My concern is would HTML keep track of the different values selected and submit the lot when submitting the form?

I have downloaded a 2-levels Javascript script from the web which works on the web but does not work when downloaded, it looks like the main part of the script is not in the download and I am reluctant to spend a lot of time in finding out why it does not work as I assume it will need a substantial rewrite for 3 or 4 levels.

Any hint most welcome.
Thank you for your help.

I guess, there would be some programming involved...

I would be able to write such a script. Nevertheless, it's you/yourself who needs to do it, after all.
I'ld be happy to assist with specific issues.

For a start, is there a link to what you've downloaded?
What's the exact data you want to display?
This is all client-side JavaScript, right?

If this data is held on the server in some form or another in which it doesn't make sense to manually create all the option groups etc. then you might consider using some language such as Perl w/ CGI.pm to construct your options lists. It is a nice tool when it comes to handle large amounts of data for forms. It also allows the use of javascript in the way it presents the data.

Thank you for your answers. While waiting for these answers I tried a plain HTML script and the result is not as clumsy or bulky as I thought it would be, in fact it's very neat, so I think I'll use it and save the time trying to solve the problem with Javascript.

To robbbert: Thank you for the offer, I tried to retrieve the original scrip but I can't find it now, it was a cut-and-paste from a free javascript scripts site.

OK. If it works that way, that's more than great.

BTW, how much KB of filesize is your HTML page. (Using client-side JavaScript, it wouldn't be smaller...)

(Just being curious. )

This HTML is just under 54k for exactly 734 entries to choose from using checkboxes, this involves a heading section of links to each main subject and, within these, a subsection of links to each sub-subject together with a submit button in each subsection.

It would probably be more efficient in Javascript but time is the biggest constraint.