Quite a blast, huh?! I am using Dan Schroeder's tutorial to figure this stuff out!
In case anybody else wants to play like this in blogger... I am not entirely sure, but it seems like variables are shared across scripts, across posts. The code I put in one post interacts with the code I put in other posts. So far I am managing this by making lots of new variable names. Maybe there is a better way, but I don't really plan to take this little project very far anyway!