var headID = document.getElementsByTagName("head")[0];         
var cssNode = document.createElement('link');
cssNode.type = 'text/css';
cssNode.rel = 'stylesheet';
cssNode.href = 'http://img.marten-online.com/pwproj/zoomer/pwzoom-example.css';
cssNode.media = 'screen';
headID.appendChild(cssNode);