Online listening test?

[superspiffy]

Is there a site or a program somewhere that gives you a full frequency test? I want to know up to what frequency can I still hear. And even which of my ears is better or worse. This might help me on deciding whether I should start converting stuff to a higher bitrate or even lossless and whether I should even buy expensive earphones.

[bobb-mini]

U can go to your doctor and complain unable to hear some frequencies, and have him order a test for you.