How can I read an ID-value from the LMS and insert this into an URL?

Hi

Right now I am struggling with a little problem. Hopefully anyone here knows the answer. For the latest course I am building (Captivate 6), it is necessary that at one point the course reads an ID-value from the LMS. After that, this ID should be inserted into an URL.

To be more precisely: the ID must be read (getValue) from cmi.archive_id and inserted into an URL like that: http://.../archive.php?action=pdf&objectID=ARCHIVE_ID.

Unfortunately I am more of a designer und less of a javascript-maestro (well...I am a javascript-noob to be precisely), therefore I am pretty clueless how to do that. I tried a simple executed action (run Javascript: cpEIGetValue('cmi.archive_id'); and after that open URL http://.../archive.php?action=pdf&objectID=ARCHIVE_ID), but...well...that didn't work.

Any ideas?

Thanks a lot in advance