toUpper (or not toUpper)?

[Mark Swindell]

I'm confused why this portion of a script refuses to run.  It runs  
fine from the message box.  Any ideas?


         put 4 into vUpperMe
         toupper(char vUpperMe of tText) -- it breaks here at toUpper

Error 573:	Handler: can't find handler
Hint :	repeat: error in statement
Error at	char 1 of line 29 in handler mouseUp
Code:	toupper


Thanks,
Mark