Need creative thoughts to this problem...

I looked around for a while but did not find a solution to this question, and I think it might not be possible.

Here's the situation:
- Someone is image leeching a product image on my site (which I do not have not a problem with)
- On their blog, the anchor tag points to myimage.jpg so when someone clicks on the image in their blog, I get the traffic but it pulls up the image on my site
- My product page also uses myimage.jpg

What I'd like to happen:
- Continue to allow the image leeching
- But when they click on the image and get to myimage.jpg redirect them to my sales page for the product page i.e. buymyproduct.php
- Hopefully make that click a sale!

Maybe I'm not familiar enough with htaccess...I've tried various rewrite conditions but with no luck.

Is this even possible? and if it's not with with htaccess, anyone have a clever idea to achieve my desired outcome?

Thanks in advance

No this isn't possible. Since they have all the control over the code if it's on their site. But I recommend you don't let them leach from you. Which is wasting your bandwidth, and costing you money.