Will A DHTML Overlay Or ThickBox Capturing Email Hurt SEO?

[onlineinitiatives]

Some of our competitors use an overlay window on all their pages to sign a customer up for an email list (usually offering a coupon).  Our questions is related to the impact on SEO the overlay might have.

Does anyone have experience doing this and is this a "safe" thing to do related to SEO?

Thanks...

[AlanMosley]

If i went to such a page, i would be out of there.

The idea is spammy, and in your face.

My advice, dont do it