Problem with mixing results (mysql)

Ok... Here is an example of what I am after...

I have two tables...
TESTA and TESTB
which both have the following fields.
id
date
title
body
difference

Now I want to return the full results for both tables.... in date order.... but mix the results.

So for example.... I can get these results very easy...
Result a
id - date - title - body - difference
1 - 20/06/06 - This is title - This is the main body - testa
2 - 23/06/06 - This is title - This is the main body - testa
3 - 26/06/06 - This is title - This is the main body - testa

Result b
id - date - title - body - difference
1 - 20/06/06 - This is title - This is the main body - testb
2 - 22/06/06 - This is title - This is the main body - testb
3 - 25/06/06 - This is title - This is the main body - testb

Now this is the result I would like from the above data for example...
id - date - title - body - difference
1 - 20/06/06 - This is title - This is the main body - testa
1 - 20/06/06 - This is title - This is the main body - testb
2 - 22/06/06 - This is title - This is the main body - testb
2 - 23/06/06 - This is title - This is the main body - testa
3 - 25/06/06 - This is title - This is the main body - testb
3 - 26/06/06 - This is title - This is the main body - testa

Any ideas people?

It could be very easy to do... but have mind blank.