list insert function

this.insert = function insert(after, name){
     ph=this;
     while(ph.name!=after && ph.hasNext()){
        ph=ph.getNext();
     }
     if(ph.hasNext()){
         phnext=ph.getNext();
     }
     ph.setNext(new Column(name));
     if(ph.hasNext()){
         ph.getNext().setNext(phnext);
     }
     console.log(ph);
 }