Rounding Problems?

Hi,
I have this pl function:
CREATE OR REPLACE FUNCTION ceilDecimal(num float) RETURNS float AS
$BODY$
BEGIN
RETURN CEIL(num * 100) / 100;
END
$BODY$
LANGUAGE 'plpgsql';

It is supposed to do a "decimail ceil" for 2 decimal places.
But when I do "SELECT ceilDecimal(0.07)"
It will return
ceildecimal
-------------
0.08

For other numbers the result is as expected:
SELECT ceilDecimal(0.17);
ceildecimal
-------------
0.17

WHY? rsrsr

Thanks in advance!

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