BST_remove

BST.prototype.Remove = function(node){
  if(!this.root || node == undefined){
    return -1;
  }
  if(!(node instance of Node)){
      node = new Node(node);
  }
  var current = this.root;
  var parent = current;
  while(current.value != node.value){
      if (current.value < node.value){
          parent = current;
          current = current.right;
      }
      else{
          parent = current;
          current = current.left;
      }
  }
  if (current.value != node.value){
      return -1;
  }
  if (!current.left && !current.right){
    if (current.value < parent.value){
        parent.left = null;
    }
    else{
        parent.right = null;
    }
  }
  if (current.left){
      var runner = current.left;
      var papa = current;
      while (runner.right){
          papa = runner;
          runner = runner.right;
      }
    else{
        var runner = current.right;
        var papa = current;
        while (runner.left){
            papa = runner;
            runner = runner.left;
        }
    }
  }
    var temp = current;
    current = runner;
    runner = temp;
    if(current.value < papa.value){
        papa.left = null;
    }
    else{
        papa.right = null;
    }
    return runner
  }