<$mt:WebsiteID$>

Outputs the numeric ID of the website currently in context.

Movable Type User Manual
Crack it open and see what's under the hood
Movable Type Forums
A place to help and be helped.
ProNet
Can't figure it out on your own? There's a growing list of MT professionals who would be glad to help out.
All Support Docs »

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Movable Type.org