[Typo3] Insert of text value into Typoscript

[Steven Bagshaw]

Hi All,

I have what seems to be a very simple thing to do, but for the life of me I
cannot find how to do it (or figure a workaround that doesn't involve
writing PHP.

I have a menu that I want to wrap a link around. The link will do some
Javascript whizzy stuff, but for users without Javascript enabled, clicking
on the link should go to a specific URL, which is a page within my site.
Here is my current setup

20.1 = TMENU
    20.1 {
      wrap = <br/><div class="showMoreLink"><a href="SOMEURL"
onClick="javascript:showMore(2, 'Show more sectors', 'Hide extra sectors');
return false;"><img src="fileadmin/img/wvw/blaar.gif"/><span
id="moreText2">Show more sectors</span></a></div><div id="showMoreFull2"> |
</div>
      NO.stdWrap.field = subtitle // title
      NO.allWrap = <div> | </div>
      NO.beforeImg = fileadmin/img/wvw/grar.gif
      NO.beforeImgLink = 1
    }

Now I want to replace SOMEURL with a link to a specific page ID, which would
be generated within the template code. Let's say I have used typolink to
generate the URL - how would I then insert this value into the wrap?

I have seen how one can insert constants using {$constantName} and data
using {field:uid} etc., but I cannot find how one can similarly insert
values from within the template itself. I must be missing something...

Thanks,

Steve