ksh substitution

Hello,

I thought it was possible to use several time a #! entry on a script but it doesn't seems to work. My need is to have a part of a ksh script without substitution so it would look like

#!/bin/ksh
--
first part
---
#!/bin/ksh -f
--
part without substitution
--
#!/bin/ksh
--
third part
--
Thx!

You can turn off globbing by using "set -f".
Turn it back on by using "set +f".

The hash bang pair "#!" are only significant if they are the first two characters in the script file.

Ouch! So simple.
Thx.