First of all, double posting is unnecessary. We'll get an answer for you eventually.
Now, your post is really eccentric and very hard to understand (for me at least). Not sure what you're trying to do. Why do you want to store a submitted variable in a session?
And you really contradict yourself by saying:
But i need the comments0 to be automatic.
. . .
.. but i need it to replace the comment0 in the code above...
Which is it?
If perhaps you can better explain yourself, please do so. I would be more inclined to help if you took the time to actually explain in detail (as much as you can) about what you are trying to do, what you have done, and what the output is compared to what you want.
~Brett