How to compile in earlier versions using new keywords?

[-hh]

Is there a way to *compile* the following script in LC versions before 7?

on mouseUp
  if char 1 of the version > 6 then
     put trueword 1 of fld "IN" into fld "OUT"
  else put word 1 of fld "IN" into fld "OUT"
end mouseUp

The use of the try structure doesn't help, the script doesn't even
*compile*. The same with "segment" and other new terms of LC 7/8.

More generaly, is there a way to "hide" some script blocks so that 
the compilation in all earlier versions handles the block as comment? 




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