Ecommerce site with currency selectors giving dupe content?

[BeachDude]

Hi everyone,
One of my ecommerce sites uses BigCommerce.  They have a feature where you can add different currency buttons to change the currency that the customer can shop as.

This is great because if people from the UK visit our site, they can change the currency to their own rather than US. It just ads a variable on the end of the URL string to change the currency.

However, in my webmaster tools I noticed that I think i am getting a bunch of duplicate content.  For example, it thinks i have duplicate title tags for the following:

domainname/pages/my-cool-widget.html
domainname/pages/my-cool-widget.html?setCurrencyId=1
.domainname/pages/my-cool-widget.html?setCurrencyId=2
domainname/pages/my-cool-widget.html?setCurrencyId=3
domainname/pages/my-cool-widget.html?setCurrencyId=4

I thought about adding "rel=no-follow" but unfortunately I don't have access to this file to edit the code.  Any suggestions?

[AdamThompson]

Use the canoncal meta tag.

[BeachDude]

Forgot to mention that the currency selector button is included in every page on the site (in the header include file)

So how do i create a canonical meta tag when it is on every page?  That whole thing is kinda confusing

[AdamThompson]

You will need to programmatically add the canonical tag to every page on your site (just make sure you do it correctly!) so that every page has a tag indicating which is the canonical version of that page (the version without the setCurrencyId variable in the url).

Here are more details on the canonical tag.

Another possible solution would be to use GWT to instruct Google to ignore that variable in the URL.

[BeachDude]

Solid info!

Just so I make sure I got it right, a few examples would be :

Homepage

[AdamThompson]

You've got the right idea. Just be very certain that the url used in the canonical is the correct url for each page.

[BeachDude]

Awesome, thanks so much for your help!

[BeachDude]

Quick follow up-

Due to my ecommerce cart, I'm not able to modify the canonical tag on invdividual pages.  However, Adams other suggestion to use webmaster tools was great and I tried that.  I went into the site configuration settings and then clicked on parameter handling.  Google had already detected the setCurrencyId parameter, so I changed it to be "ignored."

Hope that helps someone.