We have a site that contains a "sign up" form in the sidebar in most pages. This signup contains a dropdown of countries, the contents of which are being indexed by google and affecting our sites SEO. 

Is there any recommended way to resolve this. As far as I can tell the options are:

1) Make the dropdown load dynamically via javascript (not an option for us since we need to work for non-jsj clients)

2) Take the signup form, stick it in its own page, and include that page in an iframe instead. This way, google will index that seperate file once only and so the country dropdown options should not be ranked so highly.

Are there other options?

Thanks