Asking price for use of photo

I've been approach by a company wanting to publish a photo of mine for two weeks on several websites as part of an advertising campaign. The photo will remain my property i.e. there's no exclusive rights whatsoever involved.

I had a look at the recommended prices for photo use on this page, however it seems to me as if the above request can't be categorized as "web presentation". And the company will be making a profit from the adverts.

Can anyone who has experience with photos being sold please advise me on a suggested price (US$)?

Thanks!

Go to Alamy and search for any photo e.g. 'sunshine', view any of the images and there will be prices presented for different scenarios. Might not be perfect but may give you a starting point.

Many thanks!