Populating a cell with a calendar month based on the previous date in another cell.

Trying to word this right.

I have one cell with a date of 01/01/2010.

I have other cells that I want to be equal to this cell plus 1 or more months.

For example A1=01/01/2010

I want A2 to = 02/01/2010 based on one calendar month entered into A1.

So if A1 changes 03/01/2010, A2 will = 04/01/2010.

thanks for any help,
Nick