RJS: Check for existing page element?

I have a textfield with the id "foo" that sometimes exists and sometimes not. If it exists I'd like to fill in a certain value. How do you do this by using **RJS** (in *Rails 2.2*)? I tried this and it doesn't work: if page[:foo] page[:foo].value = "bar" end I get > TypeError: Null Value if the textfield doesn't exist .

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