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