We have a well respected website, whose homepage has ranked well in Google for an important (to us) Search Phrase.
Recently, we have been investigating the impact on signups of a 'lightbox' / alert box which pops up automatically whenever a new person views our homepage. The lightbox just contains some information and a form encouraging people to signup.
Will this auto-lightbox affect our Search Engine position for our imporant phrases? Or does Google look past the lightbox.
Thanks for any help