[Koha] Enable PHP in OpacMainUserBlock

[Owen Leonard]

> We've done this by having a script generate HTML for the covers each
> night and using javascript to include it on the page.

You can also use an iframe to pull in content from a different page.
This is useful if you don't have access to PHP on the server on which
Koha is installed.

  -- Owen

-- 
Web Developer
Athens County Public Libraries
http://www.myacpl.org