Doubble Functions?

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If you have a While or Repeat inside a function, it will be stuck inside that function until the While or Repeat conditions are met. That's why you only get one thing running. I'm not sure what Timer() does in your program, I'm assuming something like this:
Function Timer()
time = Millisecs()

While Millisecs() < time + 30000 ;wait 30 seconds
 Text 10,10,(Millisecs - time)
 Flip
Wend
Text 10,10,"Time's up!!!"
End Function

problem here is that the program remains in Timer() until the complete 30 seconds is up, not executing anything else.
If you use something like this, it'll work better:
...some setup code

Global time
Global timeup = False

;main program
time = Millisecs()
While Not timeup
 Timer()

 ... Do other stuff

 Flip
Wend
Text 10,10,"Time's Up!!!!!!"

 ...Some other code

Function Timer()
If Millisec >= timer + 30000 Then timeup = True
End Function


My code is missing some elements like setting graphics mode and actually doing anything while the timer runs, just showing you the basic flow here.