Script Question for CL: If statement, where to put EndIf?

"ppromax-/[email protected] [power-pro]" <[email protected]>
Newsgroups gmane.comp.windows.power-pro
Message-ID <[email protected]> 
Greetings Gurus, I'm using the *script function in a CL to execute the line below. This is an IF statement
 (win.visible("c=TFullScreenWindow")) do win.show("c=TFullScreenWindow") endif
 
 

 
 

 If I exclude the endif powerpro crashes my computer.
 If I include the endif the script works but i get the error below.
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