Cannot reference map item in Visual Force (Syntax Error)

I have the following problem: in my VF page I'm trying to reference a map object someMap with the following simple code:
{!someMap[0]}

but I keep getting the following error while saving the file:
Error: Syntax error. Found 'someMap'	
graham on 03-07-2013 12:22
Check the API version of your VF page. Maps are supported with API 20.0 and greater.
graham on 03-07-2013 12:22

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