add/remove class from custom HTML Wibiya 'app' when media queries aren't supported

gistfile1.js

/**
  * A quick and dirty function to apply a className to a custom html snippet 
  * in the Wibiya toolbar in browsers that do not support media queries, w/out 
  * bothering to learn the Wibiya API. Include before the closing </body> tag.
  *
  * Was written specifically to provide IE support for the following snippet
  * of html and css:
  */
// <style type="text/css">
// @media screen and (max-width: 740px) {#wibiyaToolbar_support_key span { display:none; padding-left:60px;padding-right:0}}
// #wibiyaToolbar_support_key {color:#e1e1e1;font-weight:bold;line-height:1;display:block;width:auto;height:18px;padding:6px 10px 0 65px;background:#675388 url(http://example.com/images/keyicon.png) no-repeat 5px top}
// #wibiyaToolbar_support_key:hover,
// #wibiyaToolbar_support_key:focus {color:#FFF}
// #wibiyaToolbar_support_key > .n {display:none!important}
// </style>

// <a title="your support is the key" id="wibiyaToolbar_support_key" href="http://example.com/"><span>This is a label</span></a>
  

(function() {
    var ct = 0, id = 'wibiyaToolbar_support_key';
    function w() {
        if (typeof wibiyaToolbar == 'object') {
            if ((function () {
                var style = document.createElement('style'),
                div = document.createElement('div'),
                uid = '__nsf_rand-' + (+new Date()),
                ret;
                div.id = uid;
                style = ['&shy;', '<style>', '@media screen and (max-width: 9999px) { #' + uid + ' { display:none !important } }', '</style>'].join('');
                div.innerHTML += style;
                document.documentElement.appendChild(div);
                ret = (window.getComputedStyle ? getComputedStyle(div,null).getPropertyValue('display') : div.currentStyle['display']) != 'none';
                div.parentNode.removeChild(div);
                return ret}()))
            (function() {
                var label = document.getElementById(id).firstChild;
                function resize() {
                    return label.className = ((document.documentElement.offsetWidth || window.innerWidth) < 710) ? 'n' : '';
                };

                if (window.attachEvent)
                    window.attachEvent('onresize', resize);
                else if (window.addEventListener)
                    window.addEventListener('resize', resize, false);
            }())
        } else if (ct++ < 4) {
            setTimeout(w, 200 * ct);
        } else
            return;
    }
   return w();
}());