Merge information in two worksheets, in specified order

Hi, I'm trying to merge two workbooks to one, but it's a bit more complicated than I'm used to
Using Excel 2011 on Mac

I want Column A and B from sheet 1 and Column A and B from sheet 2 to become A,B,C and D in sheet 3.
I would also like to have two blank columns after the first four ones, and then start again.

It should look something like this:
X=Blank
1,2=sheet number
A1 B1 A2 B2 X X C2 D2 C2 D2 X X E1 F1 E2 F2 X X............