You can use this function to add an child to a DOM element.
function addElement(parentId, elementTag, elementId, html)
{
// Adds an element to the document
var p = document.getElementById(parentId);
var newElement = document.createElement(elementTag);
newElement.setAttribute('id', elementId);
newElement.innerHTML = html;
p.appendChild(newElement);
}
function removeElement(elementId)
{
// Removes an element from the document
var element = document.getElementById(elementId);
element.parentNode.removeChild(element);
}