Cos stamping { f1 to f2 then f2 to f1 ( f1 same university)}

[tembvicky06]

Hi,
I came here as a f1 student then i changed on f2(in my wife's university) now changed back to f1 in the same university in which I originally came). my visa stamp (f1) still valid till 2014(old one) but my i20 changed (paid SEVIS again)so do i need obtain new visa stamp if i will go out of united states and reenter. help Appreciated.

Thank you.