Variable Typing Question

programming flash
1

So lets say I have a function in which I drag around a Display Object.

if i pass that function the Object to be dragged how do i type the variable.


function drag(targ:Sprite)
{
  //do drag stuff
  //but what if the targ is a Movieclip
}

if I cast the object to Sprite should this take place when the function is called?

drag(Sprite(clip))