> Httrack doesnt seem to be able to parse the following java
> script, any ideas?
Do you have "Options > Links > Attempt to detect all links" ticked?  With that
ticked, HTTrack should find the URL in the javascript.

Also, if you want HTTrack to follow that URL but it is on a different site,
you will need to add it to the filters.
+www.url.com/*