I want to get property of previous object from array

Hi

Here is my code

for(var i in MovieClip(root).arrySpt){

  var btn:MovieClip = MovieClip(box);

  //duplicate the movielcip (add a new one to the stage)

  var ClassDefinition:Class = Class(getDefinitionByName(getQualifiedClassName(btn)));

  var myMC:MovieClip = new ClassDefinition;

  myMC.inBin.text = MovieClip(root).arrySpt;

  trace(getChildByName("myMCC"+i as String).width);

  myMC.x = i * myMC.width;

  myMC.y = 0;

  myMC.velocityY = 0;

  box.addChild(myMC);

  box.boxin.visible = false;

}

  var myMC:MovieClip = new ClassDefinition;

     Here movieclips are creating and this line of code is assigning the position

myMC.x = i * myMC.width;

Here the width is assigning to X position of current object but I want assign width as X position to next object not current object. Mean If movieclip generate it should get width from previous movieclip from array.

please help me to solve this problem.

thanks