A gotoAndPlay problem

hello I have 11 movie clips that are basicly 1 pics that movie from right to left or left to right depending on the Larrow or Rarrow you click, but the picture mc dosnt play. The picture mc instence names are p1, p2, p3, - p11. And here is my code for the right arrow button

on(release){
this._parent.curentphotomun++;
if(this._parent.curentphotomun > this._parent.totalphotonum){
this._parent.curentphotomun = 1;
}
“p”+this._parent.curentphotomun.gotoAndPlay(“in”);
}

the top part works fine but the “p”+this._parent.curentphotomun.gotoAndPlay(“in”); dosnt play the movie clip with the picture movment in it. can any one help?