Re-directs with javascript?

[kade119]

Instead of just forwarding multiple domains - is it okay to create an index file for alternate addon domains and insert some javascript to redirect it to my primary domain that way i can input meta data with those other domains so all of them get optimized?

Then my 2nd question is - if i have an existing site but change the domain name and do a redirect/forward with the domain used previously will all the URL path links that have been crawled will they use the same path but with the new domain name?

instance http://www.mypage.com/tutorials and i change my domain to http://www.newpage.com/

will the link that is on someone elses webite know to go to http://www.newpage.com/tutorials?

thanks