Include file in postbit Template

[LorenzoP]

Hi, (sorry for my english!)
i have a problem to include a file in postbit page.

I insert the correct obstart in phpinclude_start.

If I insert the variable

$xxx

in header template I look the page included, but if I insert the $xxx variable in postbit template I don't look the output of the page who I have include.

Thanks
Lorenzo