Lookup htaccess redirects - there are different types, depending on your SEO needs, so proceed with caution here. The suggestions listed above will certainly work, but make sure you know how they work before implementing them.
Daniel B., CEO - Bezoka.com and Ungigs.com Hosting Solutions Optimized for: WordPress • Joomla • OpenCart • Moodle Data Centers in: Chicago (US), London (UK), Sydney (AU), Sofia (BG), Pori (FI) Email Daniel directly: ceo [at] bezoka.com
If you can do that or that is not working trough htacces file I suppose that would be good idea to get in touch with your web hosting service provider nd ask to have that done on the server side. Good luck