From http://stackoverflow.com/questions/805384/how-to-apply-inline-and-or-external-css-loaded-dynamically-with-jquery

dynamically create <link>.js

var myStylesLocation = 'http://www.gregdevtest.net/bootstrap/dist/css/bootstrap.min.css'

$('<link rel="stylesheet" type="text/css" href="'+myStylesLocation+'" >')
   .appendTo("head");