HELP please - How to order images from two cameras

Hello
Just shot a wedding and I used two cameras (D70 and a D70s) to cover the event. When I edit and present images I like them in chronological order. As I was cutting between cameras throughout the day by downloading the memory card the shots are going to be out of order.
I know in windows explorer I can sort images by date and this should work to put them in chronological order as I have set the cameras to the same time (or near enough).
However, how do I rename the files so the numbering in also in order in line with the timeline? So the first image shot is is 001 and then on from there.
Any ideas?
Just shot a wedding and I used two cameras (D70 and a D70s) to cover the event. When I edit and present images I like them in chronological order. As I was cutting between cameras throughout the day by downloading the memory card the shots are going to be out of order.
I know in windows explorer I can sort images by date and this should work to put them in chronological order as I have set the cameras to the same time (or near enough).
However, how do I rename the files so the numbering in also in order in line with the timeline? So the first image shot is is 001 and then on from there.
Any ideas?