Are there any syntax errors with this JS code?

var taskInput = document.getElementById("new-task"); //new-task
var addButton = document.getElementsByTagName("button")[0]; //first button
var incompleteTasksHolder = document.getElementById("incomplete-tasks"); //incomplete-tasks
var completedTasksHolder = 
document.getElementById("completed-tasks"); //completed-tasks

//New Task List Item
var createNewTaskElement = function(taskString) {
  //Create List Item
  var listItem = document.createElement("li"):

  //input (checkbox)
  var checkBox = document.createELement("input");
    //label
  var label = document.createElement("label");
    //input (text)
  var editInput = document.createElement("input");
    //button.edit
  var editButton = document.createElement("button");
    //button.delete
  var deleteButton = document.createElement"button");
    //Each element needs modifying

    //Each element needs and appending
    listItem.appendChild(checkBox);
    listItem.appendChild(label);
    listItem.appendChild(editInput);
    listItem.appendChild(editButton);
    listItem.appendChild(deleteButton);


  return listItem;
}

//Add a new task
var addTask = function() {
    console.log("Add task...");
        //Create a new list item with the text from #new-task
  var listItem = createNewTaskElements("Some New Task");

  //Append listItem to IncompleteTasksHolder
  incompleteTasksHolder.appendChild(listItem);




}

//Edit an existing task
var editTask = function() {
  console.log("Edit task...");
  //When the edit button is pressed
      //if the class of the parent is .editmode
        //switch from .editMode
        //label text become the input's value
      //else
        //switch to .editMode
        //input value becomes label's text

      //Toggle .editMode on the parent 

}

//Delete an existing task
var deleteTask = function() {
  console.log("Delete task...");
    //when the delete button  is pressed
      //remove parent list item from the ul

}

//Mark a task as complete
var completeTask = function() {
  console.log("Complete task...");
    //When the checkbox is checked
      //Append the task list item to the completed-tasks

}


//Mark a task as incomplete
var incompleteTask = function() {
  console.log("Task Incomplete...");
    //When the checkbox is unchecked
      //Append the list item to incomplete-tasks

}  

var bindTaskEvents = function(taskListItem, checkBoxEventHandler) {
  //select taskListItem's children
  var checkBox = taskListItem.querySelector("input[type=checkbox]");
  var editButton = taskListItem.querySelector("button.edit");
  var deleteButton = taskListItem.querySelector("button.delete");
    //bind editTask to edit button
    editbutton.onclick = editTask;
    //bind deleteTask to delete button
    deletebutton.onclick = deleteTask;
    //bind checkBoxEventHandler to checkbox
    checkBox.onchange = checkBoxEventHandler;

}


//Set the click handler to the addTask function
addbutton.onclick = addTask;

//Cycle over the incompleteTasksHolder ul list items
for (var i = 0; i < incompleteTasksHolder.children.length; i++) {
      //bind events to the list item's children (taskCompleted)
  bindTaskEvents(incompleteTaskHolder.children[i], taskCompleted);
}


//cycle over completedTaskHolder ul list items
for(var i = 0; i < completedTasksHolder.children.length; i++)  {
  //bind events to the list item's children (taskIncomplete)
  bindTaskEvents(completedTasksHolder.children[i], tasksincomplete);
}