Async load css

gistfile1.txt

    <script>
    z = document.getElementsByTagName('link').length
    for (i = 0; i < z; i++) {
        function loadStyleSheet(i){
            if (document.createStyleSheet) document.createStyleSheet(i);
            else {
                var stylesheet = document.createElement('link');
                stylesheet.href = i;
                stylesheet.rel = 'stylesheet';
                stylesheet.type = 'text/css';
                document.getElementsByTagName('head')[0].appendChild(stylesheet);
            }
        }
    }
    </script>