Problem w/ Multiple Tweens

Hi, I’m trying to have four different movie clips (panel1, panel2, panel3 and panel4) move left and right across the stage and then have them stop after let’s say 5 secs. I’m trying to apply the tween class and ease them in. However, only one movieclip will work at a time with the code I have. Any suggestions? Thanks. (The code is applied on its own layer on the main stage)

var panelTween:Tween = new Tween(panel4, “_x”, Regular.easeIn, 0, 729, 2, true);
panelTween.onMotionFinished = function (){
this.yoyo()
}

var panelTween:Tween = new Tween(panel2, “_x”, Regular.easeIn, 0, 729, 2, true);
panelTween.onMotionFinished = function (){
this.yoyo()
}

var panelTween:Tween = new Tween(panel3, “_x”, Regular.easeIn, 0, 729, 2, true);
panelTween.onMotionFinished = function (){
this.yoyo()
}

var panelTween:Tween = new Tween(panel4, “_x”, Regular.easeIn, 0, 729, 2, true);
panelTween.onMotionFinished = function (){
this.yoyo()
}