TWO Domains name to the one site

I am looking for someone to sort out a problem i have.... I have a website that is on my .com domain name.... I have just purchased a .[login to view URL] domain name as I want the search engines to pick up that my site is of Australian origin, The company that is doing my meta tag optomisation said the easiest way to do this is to buy the .[login to view URL] domain which i have done.... The .[login to view URL] domain has been pointed to the .com website but the optomisation company had this to say: Quote Unfortunately your site is hosted on a server owned by [login to view URL] and is located in the USA. The combination of your site having a .com domain and being hosted in USA means that Google does not recognise your site as being Australian. The easiest solution to overcome this problem without moving your website to a new hosting provider is to register a .[login to view URL] domain Your hosting provider should allow you to use both domain names on your account. Unquote I have spoken to my hosting company and they are not aware on how to do this, Somone mentioned a 301 redirection....but i dont know what this is or how to do it..I want search engines to pick up both the .com and .[login to view URL] domains without getting any penalties from the search engines... I hope someone knows what i am on about