Changing to SEFurls and affects on ranking

Hi

I use Joomla 1.5 and have just switched on the SEFurl feature. My urls now look moere friendly, however, will the search engines, who have my old non-SEFurls listed get confused and drop me in the listings when they find the new urls?

I´m not sure if Joomla has inbuilt automatic url redirect, or if I need it? If so, how do i do that?

Thanks for any help

afaik Joomla does not have any 301 (or 302 etc) redirects and you will have to do a 301 on the webserver for each url, this may be a bit of a mission, so either change it back, ride it out or do the work?