Can you save variable data into flash?

@Gordon - thank you, I got that part sorted =)
Now, I have another annoyance - after some time of working ok, I get some random errors like this:

>
Uncaught ReferenceError: "pin" is not defined
 at line 1 col 1
pin changes
^
in function called from system
Connected to PM
Uncaught ReferenceError: "pin" is not defined
 at line 1 col 1
pin changes
^
in function called from system
Uncaught ReferenceError: "unction" is not defined
 at line 1 col 1
unction() { // every 10 seconds
^
in function called from system
Uncaught ReferenceError: "pin" is not defined
 at line 1 col 1
pin changes
^
in function called from system

Its like its of memory or something. I just dont know what to check as after restart it starts working again... for some time