gaaanz einfach:
Math.round(x * 100) / 100;
in javascript
round a float with two digits after the comma in JS
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Dipl.-Ing. Dr. Barbara Ondrisek
electrobabe.at 
As much as I don’t want to say that PHP did anything good for the world at all, I do like the second parameter of the round function in PHP..
http://at.php.net/round