Add Direct Credit Payment option to oscomm site

Hi, Easy one - We need to add a Direct Credit payment option into our oscomm site - pay directly into our bank. This should be very easy and quick - but we do not have the time to look at this. Payment option name - Direct Credit - available to all purchases When selected order needs to be ok'd and progress Text on Footer of Invoice needs to read If paying by Direct Credit, Please deposit the full invoice amount into the below Bank account. please use the order number as the payment referance, The items will be shipped once payment has cleared to our bank account. SpeedNet Communications LTD. ASB Bank 12-****-******-*** (we need to be told whatfile to edit for these details, and we will fill in the rest No silly bids as we know it will not take long etc. Payment upon completion only - no escrow