How To Figure Out If An Input Box Exists Without Getting An Error

Nov 23, 2005

I can display the value of the following input box with
alert(parent.MyFrame.document.MyForm.MyInput.value );

But if the frame, the form or the input box doesn't exist I get of course an
error message.
How can I figure out before I display the value if the frame 'MyFrame', the
form 'MyForm' and also the input box 'MyInput' exists without getting an
error message?

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