How to use classes with the Movie Clips

Hi guys!I have a movie clip called teacher.It's assigned to a class called teacher.It has a location(room).I have multiple rooms and so i want the teacher to be only visible in the room it's at.I have two buttons for each room.The problem is the teacher doesn't disappear when it's in the playroom.
package {
          import flash.display.MovieClip;
          public class teacher extends MovieClip {
                    var room:String;
                    room="classroom";
                    this.croom=croom;
                    public function teacher() {
                              var teacher:teacher=new teacher();
                    if(teacher.room!==croom){
                              teacher.visible=false;
                    if (teacher.room==croom){
                              teacher.visible=true;
clroom.addEventListener(MouseEvent.CLICK, fl_MouseClickHandler);
function fl_MouseClickHandler(event:MouseEvent):void
          croom = "classroom";
          classroom.visible = true;
          playroom.visible = false;
btn.addEventListener(MouseEvent.CLICK, fl_MouseClickHandler_2);
function fl_MouseClickHandler_2(event:MouseEvent):void
          croom = "playroom";
          classroom.visible = false;
          playroom.visible = true;

Where is all of the code you just showed?
Only a portion of it is a class file's code, and of that class file's code, only a portion of it is valid. The paret where you have the conditional checking the treacher's roon is not incorporated proerly... it needs to be inside some function of the class.

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