add = function(el, type, fn, capture) {
            if (el && el.addEventListener) {
                el.addEventListener(type, fn, capture);
            } else if (el && el.attachEvent) {
                el.attachEvent('on' + type, fn);
            }
        }
Page-level config applied to all YUI instances created on the
            current page. This is applied after `YUI.GlobalConfig` and before
            any instance-level configuration.

            @example

                // Single global var to include before YUI seed file
                YUI_config = {
                    filter: 'debug'
                };

                YUI().use('node', function (Y) {
                    // debug files used here
                });

                YUI({
                    filter: 'min'
                }).use('node', function (Y) {
                    // min files used here
                });

            @property {Object} YUI_config
            @global