math - Float sum with javascript

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...)

Answer

Once you read what What Every Computer Scientist Should Know About Floating-Point Arithmetic you could use the .toFixed() function:

var result = parseFloat('2.3') + parseFloat('2.4');
alert(result.toFixed(2));​