Hello,
I've a problem with Artio JoomSEF 1.5.1

the url's look good, but after installing the www. in the browser is disabled

that means, I type my address:

www.mechanix.info
and I get:
mechanix.info/ >without www. in front

after installing JoomSEF my Googleranking is complete down, before my site was on search page 1 and now we are on 5 or 6 by using the most interesting search word...

Is this because the www. is missing or is it another problem?