Tumbnail gallery

i made a great design photo gallery with tumbnnails.
but how can i let the tumbnails show in the big screen? My idea about it is to take an tumbnail and drag it into the big screen and than it will be loaded into it. Can someone help me with the actionscript?

Kind regards Jos :} :td: :cowboy: :pa: :tired: (-: :hr: ;( :rocker: :beam: :beer: :chinaman: :nose: :stunned: :party: :mario: :evil2: :bandit: :player: :b: