[thelist] pass by value in JavaScript?

[Plunkett, Matt]

I'm working on something where I'm trying to copy Options from one Select to
another.

I've found that this doesn't work:

form.select1.options[0] = form.select2.options[0];

I can only guess that this is because the objects are being passed by
reference, since the following DOES work, but feels ugly:

form.select1.options[0] = new Option(form.select2.options[0].text,
form.select2.options[0].value);

Is there a way to pass by value, or to copy an object?

Thanks,
Matt