The skin is just a setting in the database.  Since you have access to the TabId you should be able to write a sproc that would do this, though I have never tried this myself so I do not know if there are any gotchas in this (like making the change in a module may be too later to effect the current page load, so you may have to do a check and if the skin is set, then allow load, else make change and redirect back to the page so the change is seen, or something like that).

Best Regards,

Robert J Collins | Co-Founder & President

Netlogic Corporation