Forum:Poll function on MediaWiki version 1.5?

I cannot use the new poll function in my Wiki (the code for poll simply does not work). Is it because I am using MediaWiki version 1.5? Should I upgrade? Or do I need to download an extension? If so, where can I find it? How do I do this? I hope someone could help me. Thanalie 01:06, 2 February 2007 (UTC)