function ChangeStyle(stylename)
{
  LoadCSS('/styles/'+stylename+'/index.css');
  LoadCSS('/styles/'+stylename+'/button.css');
  LoadCSS('/styles/'+stylename+'/menu.css');
}

function LoadCSS(cssfilename)
{
  var cssNode = document.createElement('link');
  cssNode.type = 'text/css';
  cssNode.rel = 'stylesheet';
  cssNode.href = cssfilename;
  cssNode.media = 'screen';
  cssNode.title = 'dynamicSheet';
  document.getElementsByTagName("head")[0].appendChild(cssNode);
}