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

function HasAnyClass__CssFriendlyAdapters(element) {
    return (CanHaveClass__CssFriendlyAdapters(element) && (element.className.length > 0));
}

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

function AddClass__CssFriendlyAdapters(element, classToAdd) {
    if (HasAnyClass__CssFriendlyAdapters(element)) {
        if (!HasClass__CssFriendlyAdapters(element, classToAdd)) {
            element.className = element.className + " " + classToAdd;
        }
    }
    else if (CanHaveClass__CssFriendlyAdapters(element)) {
        element.className = classToAdd;
    }
}

function AddClassUpward__CssFriendlyAdapters(startElement, stopParentClass, classToAdd) {
    var elementOrParent = startElement;
    while ((elementOrParent != null) && (!HasClass__CssFriendlyAdapters(elementOrParent, topmostClass))) {
        AddClass__CssFriendlyAdapters(elementOrParent, classToAdd);
        elementOrParent = elementOrParent.parentNode;
    }
}

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

function SwapOrAddClass__CssFriendlyAdapters(element, oldClass, newClass) {
    if (HasClass__CssFriendlyAdapters(element, oldClass)) {
        SwapClass__CssFriendlyAdapters(element, oldClass, newClass);
    }
    else {
        AddClass__CssFriendlyAdapters(element, newClass);
    }
}

function RemoveClass__CssFriendlyAdapters(element, classToRemove) {
    SwapClass__CssFriendlyAdapters(element, classToRemove, "");
}

function RemoveClassUpward__CssFriendlyAdapters(startElement, stopParentClass, classToRemove) {
    var elementOrParent = startElement;
    while ((elementOrParent != null) && (!HasClass__CssFriendlyAdapters(elementOrParent, topmostClass))) {
        RemoveClass__CssFriendlyAdapters(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;
}

/* Derived from http://simonwillison.net/2004/May/26/addLoadEvent/ */
function addLoadEvent(func) {
    var oldonload = window.onload;

    if (typeof window.onload != 'function') {
        window.onload = func;
    }
    else {
        window.onload = function() {
            if (oldonload) { oldonload(); }
            func();
        }
    }
}