directing http to https

[ctbhost]

i have setup a secure site at subdomain.domain.com/

if i goto http://subdomain.domain.com/ i want it to redirect immediatly to
https://subdomain.domain.com/ so that if a visitor forgets the 's' they still goto the secure site

any ideas

[SarcNBit]

You can use a mod_alias redirect or a mod_rewrite RewriteRule.