Hi, I switched from one scrip to another script on a large site. and today Google Webmaster Tools gives warning of several thousand 404 errors because they try to follow the old URLs that don't exists any longer. There is a new sitemap submitted to Google and the new urls are already indexed.. so should I just wait until Googl deindex the old urls or stop to try to follow them or is there anything I can do? I already put up a 404 error page where visitors can click on HOME to go to the main page. Any suggestion please?