filter resources by drop down

This issue has been addressed but not sufficiently for my needs, here's the situation:
1) MODX Revolution 2.2.4-pl (traditional)
2) template variable (input type tag) providing a number of keywords for tagging article
3) On a news page I have a drop down box setup that pulls in all available tags within a form (post).
4) I have getresources setup to bring in all the resources I need, with &tvFilters=`tags==[some value]`

The question I have is that if I put a specific tag in the 'some value' are it works fine and filters out the results. But how do I retrieve the submitted value for the drop down box to populate 'some value' which would enable users to filter the results based on their desired tag?
[ed. note: enoch1 last edited this post 14 years, 3 months ago.]

worked it out shortly after posting the above but have only remembered to post the solution, its quite simple really.

Pulled all of he tags into a select box, then built a snippet which grabbed the select choice from the form -

then just pulled the snippet into a getresources filter (with some addtional options to remove spacing)