welcome to 2013... how to re-start invoice to numer ONE?

welcome to 2013... how to re-start invoice to numer ONE?

Hi guys

i closed 2012 with xyz number of invoices...
2013 is arrived and i need to reset the counter and start from number one

if I try to issue an invoice I still numbering 2012

what steps to reset and start from one?

thanks a lot
nicola :))

... and a great new year :-D