[jQuery] Easing Plugin brakes on all methods based on Math.exp with jQuery 1.2.X

Hello I just tested the The Excellent Easing Plugin from
http://gsgd.co.uk/sandbox/jquery.easing.php with jQuery 1.2.1. and
all methods work fine except:

expoin, expoinout, expoout

These methods use Math.exp:

expoout: function(x, t, b, c, d) {
                        var flip = 1;
                        if (c < 0) {
                                flip *= -1;
                                c *= -1;
                        }
                        return flip * (-Math.exp(-Math.log(c)/d * (t-d)) + c + 
1) + b;
                }

I cannot figure out the problem, does anybody has an idea?