<IFRAME SRC="script.php" TITLE="My Frame">
<!-- Alternate content browsers that don't support the IFRAME tag -->
<B>Some alternative content</B>
...
</IFRAME>
Also try searching IFRAME on Google for detailed specifications.
Notice:
If you use the .htaccess file in the root of eZ, accessing php files may be denied so check this file if you can't access your php scripts.
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