if (document.createStyleSheet) {
    document.createStyleSheet('css/scripts.css');
} else {
    var newSS = document.createElement('link');
    newSS.rel = 'stylesheet';
    newSS.type = 'text/css';
    newSS.href = 'css/scripts.css';
    document.getElementsByTagName("head")[0].appendChild(newSS);
}