re inserting a 2 row space between data

Hi all i have a list of dates in a row i would like to split ie

21/12/04
21/12/04
22/12/04
22/12/04

i would like to split the entire worksheet from this above to this

21/12/04
21/12/04


22/12/04
22/12/04

can this be done and if so how

thanks in advance

Instructions here: http://www.ehow.com/how_9696_insert-row-column.html