If $show[homepage] is a real variable, then it could be that $show isn't registered. Try using something like $show[member] (will only show to logged in members) and see if it works and then you will know if $show works there. If it doesn't, then that means the variable isn't registered. If it does work, then that means $show[homepage] isn't defined. So, we need to know which it is.
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