Easing a gotoAndStop(frame) given by the mouse position

Hi there.
I have an external swf loaded into the background and i want it to go to a frame according to the mouse vertical position.
Example: when the mouse is on the bottom part of the screen the movie is in the frame 0 and when it is on the top value goes to 800.
so far i did it like this:
_root.onEnterFrame = function () {
     var frame:Number = Stage.height-_ymouse;
     bgContainer.gotoAndStop(frame);
      }
But somehow i need it to ease between the values given by the mouse position so that when there is a fast movement of the mouse, the swf only gradually goes to the frame equivalent to the last mouse position.
any sugestions??
Cheers!

actualFrame ist not a number NaN so i can't use it to define a frame to the clip to stop..
I just need a function that makes something like this:
_ymouse           ---->            clip.gotoAndStop()
     1                  ---->                     1
     800              ---->                     16
     800              ---->                     26
     800              ---->                     67
     800              ---->                     135
     800              ---->                     233
     800              ---->                     358
     800              ---->                     498
     800              ---->                     571
     800              ---->                     704
     800              ---->                     731
     800              ---->                     800

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