SpellCheck.js

 var myEditor = new YAHOO.widget.Editor('editor', {
        height: '300px',
        width: '530px',
        dompath: true,
        animate: true,
        extracss: '.yui-spellcheck { background-color: yellow; }'
    });
    /* {{{ Override _handleClick method to keep the window open on click */
    myEditor._handleClick = function(ev) {
        if (this._isNonEditable(ev)) {
            return false;
        }
        this._setCurrentEvent(ev);
        var tar =Event.getTarget(ev);
        if (this.currentWindow) {
            if (!Dom.hasClass(tar, 'yui-spellcheck')) {
                this.closeWindow();
            }
        }
        if (!Dom.hasClass(tar, 'yui-spellcheck')) {
            if (YAHOO.widget.EditorInfo.window.win && YAHOO.widget.EditorInfo.window.scope) {
                YAHOO.widget.EditorInfo.window.scope.closeWindow.call(YAHOO.widget.EditorInfo.window.scope);
            }
        }
        if (this.browser.webkit) {
            var tar =Event.getTarget(ev);
            if (this._isElement(tar, 'a') || this._isElement(tar.parentNode, 'a')) {
                Event.stopEvent(ev);
                this.nodeChange();
            }
        } else {
            this.nodeChange();
        }
    };
    /* }}} */