Using a drop-down box selector to show a selection of a long list

Hi everyone,

Sorry for the awkward title. I’m currently using ModX Evolution 1.0.2 (but can easily upgrade) for a corporate Intranet site. What I would like to know is how to go about the following (if it is possible):

I have a huge list of PDFs on one page laid out as follows

Section 1

• PDF 1
• PDF 2

Section 2

• PDF 3
• PDF 4
• PDF 5
• PDF 6

...
etc. for 7 sections.

Is there any way I can put the "Section X" in a drop-down box at the top of the page so that when "Section 1" is selected in the drop-down box only "PDF 1" and "PDF 2" are listed on the page (and when "Section 2" is selected, PDFs 3,4,5&6 are listed etc.)?

Thanks, Kahli.