Okay, I see the problem: You have a variable IV01_01, but you never write any contents there. Remove that variable, we won't need it any more. Also remove the PHP code with readGET().
Then take your question RG02, and tell it to record the Variables "cid" and "srid". When you did so, you will new variable names. The question must remain on the first page. Use the new variable names in your value() command.