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It's standard MathJaX that's rendered client-side. I managed to get MathJaX + XyPic rendered server-side on my website, which is a lot nicer.

Oh, you misunderstand the level of my question; rephrased, how do maek wabpag with "MathJaX that's rendered client-side"? (o´▽`o)

They have a link to JSBin which contains an easy example html page.

Thanks!