Power to Arduino ?

Gotta power the arduino with a 9 volt battery. Is it okay ? Would it convert it to 5v itself ? P.S. -> I have got a arduino Duemilanove.

Please help anyone !

If you wire it up to the power jack then you can power it from a 9V battery. Tip to +ve and case to -ve.

A 9V square battery is not going to last very long in most applications.