[javascript] Float sum with javascript

Possible Duplicate:
Is JavaScript's Math broken?

I'm calculating the sum of several float values using javascript and... I've noticed a strange thing never seen before. Executing this code:

parseFloat('2.3') + parseFloat('2.4')

I obtain 4.699999999999999

So... what sould I do to obtain a correct value? (supposed that this is incorrect...)

(parseFloat('2.3') + parseFloat('2.4')).toFixed(1);

its going to give you solution i suppose