[Click] adding stuff to packet

[Hamid Farhadi]

hi
a newbie Q pls:

I have this packet for example: 12345
now I wanna inject "00" into it like this: 1230045
I can make 0012345, but can not make that.
I wanna do it without making an element in C. I played with 
Strip()/Unstrip()/StoreData() but no success.
any help is appreciated.

Hamid