Drag drop droptarget


i have 3 movieclips on stage (redSquare_mc, blueSquare_mc blackSquare_mc)
I would like to drag and drop one of the movieclip inbetween the other squares.

so if i have redSquare_mc, blueSquare_mc, blackSquare_mc -> I would like to drag blackSquare_mc and put it in between redSquare_mc, blueSquare_mc AND blueSquare_mc takes the position of where blackSquare_mc was initially.

does it make sense?

Please help.