Need help understanding dynamic functions...

for (nCurr = 1; nCurr < 5; nCurr++)
{
  szName = "mcIcon" + i;
  
  this.attachMovie("mcTest", szName, i);

  mcTmp = eval(szName);

  /////////////////////////////////////////
  // need to add onClipEvent for every instance
  //
  /*
  mcTmp..???..onClipEvent = new function(mouseMove)
  {
     // do interesting stuff here
  }
}

for (i = nFirstPage; i <= nLastPage; i++)
{
    szName = "mcIcon" + i;
    this.attachMovie("img1", szName, i);
    mc = eval(szName);
    mc._x = i * 30;
    mc.nCurrPage.text = i;
    
    mc.onMouseMove = function ()
            {
            //trace("["+mc+"] x:"+_xmouse+", y:"+_ymouse);    
            this._xscale =
              Math.max(50, 100 - Math.sqrt(_xmouse * _xmouse));
            this._yscale =
              Math.max(50, 100 - Math.sqrt(_xmouse * _xmouse));
           
            updateAfterEvent();    
        }
}