Using a geolocation service to serve different banners in homepage. Dangers? Best Practices?

[Darioz]

Hello, our website is used by customer in more than 100 countries.

Becasuse the countries we serve are so many, we are using one single domain and homepage, without country specific content.

Now, we are considering to use an geolocation service to identify the customer location and then to change the contents of one banner in the home page accordingly.

Might this be dangerous from a SEO perspective?

If yes, any suggesiton on how can we implement this to avoid troubles and penalties form the Search Engines?

Thanks in advance for any help,Dario

[AlanBleiweiss]

IF all you are doing is changing a graphic image banner, and if that is done solely based on country of origin evaluation there would be no negative SEO impact.