is that possible install SL and lion at same time ? (multiple boot)

hi guys. working forex company. job need secure computer. @my main os (sl) visit kind of links , install kind of apps etc. first decided buy new macbook air 11" job , not open third party link/app on it. install google chrome (+vpn) , little snitch make imposible hacked , visit forex broker website on it.
don't wanna spend money if possible on own macbook (another problem don't macbook air have no lan port use internet). have snow leopard @ moment. possible install lion ? (when turn on macbook show me multiple boot options enter os)

ps:i encrypted hard disk pgp on sl

 

you dual boot partitioning hdd/ssd in macbook, though don't know, if possible encrypted hdd.
running lion vm possibility?

 

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