Tab order issue

Hi,

I have 4 fields on a form. I have specified tab order for the First and the thrid field.

The second and the fourth field are Computed fields.

when i tab out starting from the first field the the focus moves from first to second then to thrid and lastly to the fourth field. This sequence is not expected since i have not specifed a tab order for the second and fourth field.

Note that all the fields are displayed with Native OS style.

One more thing that i dont understand is even when the third and fourth fields are computed the focus goes into them.

Can any body please help me out on this. This is a bit urgent.

Thanks & Regards,

Amit