/* Returns the source element of an event */
function sourceElement(e)
{
    if (window.event)
    {
        e = window.event;
    }

    return e.srcElement? e.srcElement : e.target;
}

/* Returns a document element using the Firefox friendly getElementById */
function documentElement(id)
{
    return document.getElementById(id);
}

/* Cancels an event, preventing further bubbling and returning false to cancel default behavior */
function cancelEvent(e)
{
    e.returnValue = false;
    e.cancelBubble = true;

    if (e.stopPropagation)
    {
        e.stopPropagation();
        e.preventDefault();
    }
}