Smart Glass and Arduino

Thanks Grumpy Mike,
I didn't know that, uhmmm..... that makes it slightly more complicated as I will be hosting the SSR in small plinth. I have also purchased this mechanic model: http://arduino-direct.com/sunshop/index.php?l=product_detail&p=155
It will arrive in 2 dd from Hong Kong, I might have to wait and use that instead then.
Quick question, will I be able to use more than one relay at time?

Many thanks

F