------------ naturally the size of offset will vary according to the equation ------------

Yep...that was also my problem.

------------ We will be introducing this offset onto the Equation Editor shortly - out month of testing is nearly complete. ------------

I am currently inserting an image tag into the document with php. Do you mean that I can access the offset via php then?

------------ If anyone has ideas on how to this, then we'd greatly appreciate the input. ------------

If the only problem ist that you can't do cross-domain calls with javascript, you could try this approach: http://www.ajax-cross-domain.com/ (Only an idea. I did not test this.)

Thanks for your help.

Dennis