left right logic

Hi,
i want to place div dynamically to left ..then 2nd div to right, 3rd to left below, 4th to below right...in this way..
how can i do this? 


EDIT NOTES:
I want DIVS to be displayed based on number of rows in table.
suppose
there are 2 rows in table hence 2 records present in table. So, total 2
divs should only be displayed ...one is to left and one to right.
 suppose there are 3 rows in table hence 3 records present in table. So,
total 3 divs should only be displayed...one is to left and one to
right. Third div should be displayed below first 2  to left side..
 
...