Which tyres will fit on a wheel which has 26*2.2 tyres atm?

Hi, I wanted to put some road tyres on my mountain bike, it has 26x2.2 tyres on at the moment, do I have to use the same width tyres or can I use something thinner?
Also would I need to get a new innertube?
(I have this bicyle viewtopic.php?f=10017&t=12876098)
Thanks for any advice
Also would I need to get a new innertube?
(I have this bicyle viewtopic.php?f=10017&t=12876098)
Thanks for any advice

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Posts
You can fit tyres down to 1.5" on any Carrera, I cant see if the Centos has the ddm or XCD (wider) rims, if you have the ddm you can go down to 1.2". Obviously you need the right size tubes to match - your current tubes would buckle up inside and you risk pinching them under the tyre bead (which will end in a puncture).
retired 9.6kg Carrera Kraken
The Carrera Hardtail combined thread - come on all you Carrera's!
The Sons Scott Genius RC20 build