function CanHaveClassAdapters(element)
{
    return ((element != null) && (element.className != null));
}

function HasAnyClassAdapters(element)
{
    return (CanHaveClassAdapters(element) && (element.className.length > 0));
}

function HasClassAdapters(element, specificClass)
{
    return (HasAnyClassAdapters(element) && (element.className.indexOf(specificClass) > -1));
}

function AddClassAdapters(element, classToAdd)
{
    if (HasAnyClassAdapters(element))
    {
        if (!HasClassAdapters(element, classToAdd))
        {
            element.className = element.className + " " + classToAdd;
        }
    }
    else if (CanHaveClassAdapters(element))
    {
        element.className = classToAdd;
    }
}

function AddClassUpwardAdapters(startElement, stopParentClass, classToAdd)
{
    var elementOrParent = startElement;
    while ((elementOrParent != null) && (!HasClassAdapters(elementOrParent, topmostClass)))
    {
        AddClassAdapters(elementOrParent, classToAdd);
        elementOrParent = elementOrParent.parentNode;
    }    
}

function SwapClassAdapters(element, oldClass, newClass)
{
    if (HasAnyClassAdapters(element))
    {
        element.className = element.className.replace(new RegExp(oldClass, "gi"), newClass);
    }
}

function SwapOrAddClassAdapters(element, oldClass, newClass)
{
    if (HasClassAdapters(element, oldClass))
    {
        SwapClassAdapters(element, oldClass, newClass);
    }
    else
    {
        AddClassAdapters(element, newClass);
    }
}

function RemoveClassAdapters(element, classToRemove)
{
    SwapClassAdapters(element, classToRemove, "");
}

function RemoveClassUpwardAdapters(startElement, stopParentClass, classToRemove)
{
    var elementOrParent = startElement;
    while ((elementOrParent != null) && (!HasClassAdapters(elementOrParent, topmostClass)))
    {
        RemoveClassAdapters(elementOrParent, classToRemove);
        elementOrParent = elementOrParent.parentNode;
    }    
}

function IsEnterKey()
{
    var retVal = false;
    var keycode = 0;
    if ((typeof(window.event) != "undefined") && (window.event != null))
    {
        keycode = window.event.keyCode;
    }
    else if ((typeof(e) != "undefined") && (e != null))
    {
        keycode = e.which;
    }
    if (keycode == 13)
    {
        retVal = true;
    }
    return retVal;
}