Domain Redirection?

I have a domain name (a subdomain) and everything is already setup on that domain. And I own another domain (a .com) and I want to redirect the subdomain to the .com. Can anyone tell me how to do that.

modify the mx entrys on the subdomain. Contact your host that hosts the subdomain and ask him to do it.

ok thanks.

or just edit a html file on the one you want to redirect and just add some simple code so when ever someone goes to the site you want redirected, it will auto redirect them to the correct site