Two pages or iframe

Duplicate content question

[apauto]

I have pages on my site which are being built now. Each page has local information for a user if they enter in their zipcode.

What I'm afraid of, is that since the pages are the same except for a block of text that changes with zipcode, I wanted to either have that block of text appear in an iframe, or have two different versions of the page, and block the page from robots with the zipcodes.

Which method would be better?

1) One page with an iframe that can have different content.
2) Two pages, neither with an iframe, and one of the pages blocked from robots.

thanks guys!

[daveVk]

if they enter in their zipcode

The search engine will not be entering zipcodes I hope. So consider what you site will look like to them, do you need to enter the zip before seeing anything etc.

Consider how important or otherwise it is to have the local information indexed. If not important perhaps use AJAX to populate a div with this info instead of an iframe.