running browser loop on the op project suit

Hi

I have a project tree that look like this

ProjectSuite3

   I

   I

  TestProject1

      I

      I

     Keywordtests

         I

         I

         Test1

         Test2

  TestProject2

      I

      I

     Keywordtests

         I

         I

         Test3

         Test4

Now i want to run all test from the top project (ProjectSuite3) on all browsers installed.

I know i can use browser loop on all installed browsers on the keyword test level

If i do that it will run like this:

test1 on IE

test1 on FF

test1 on Opera

test1 on Chrome

and then it will run 

test2 on IE

test2 on FF

test2 on Opera

test2 on Chrome

and so on

I want to run it like this:

test1 on IE

test2 on IE

test3 on IE

test4 on IE

test1 on FF

test2 on FF

test3 on FF

test4 on FF

and so on

How do i do this?

Thanks Henry