Two Currencies - Potential Dup Content?

[ac112]

Our current product listing pages currently look like this:

http://www.#*$!xx.#*$!/shop/products.asp?itemid=1601&catid=198

There is currency converter which introduces a third parameter to these links:

http://www.#*$!xx.#*$!/shop/products.asp?curtype=us&itemid=1601&catid=198
http://www.xxxxx.xxx/shop/products.asp?curtype=can&itemid=1601&catid=198

I haven't seen it yet but could this be a potential issue with spiders indexing multiple versions of these pages? What would be a good workaround, or would a nofollow on those links prevent it?

[edited by: lorax at 7:51 pm (utc) on Dec. 8, 2005]
[edit reason] delinked [/edit]

[Raymond]

You can also try to use a seperate directory (ie /uk/) and just block the spiders in robots.txt.

[otc_cmnn]

Drop the currency preferences into a cookie or session variable. Don't pass them through the URL string.

Dupe content big time with no good reason to do so other than being lazy.