COMBO on safari 3.0.3

I am trying your demo for combo on safari 3.0.3 on windows. It does not seem to work if you try and list on all the options on the combo? Can you please let me know what browsers and os support the writeable combo?

Thanks

Gautam

IE 5.5-7.0
Firefox 1.0-2.0
Safari 3.1 and 3.0.4
Opera 9