<head> <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script> <script src="vex.combined.min.js"></script> <link rel="stylesheet" href="../css/vex.css" /> <link rel="stylesheet" href="../css/vex-theme-os.css" /> </head> <body> <script> vex.defaultOptions.className = 'vex-theme-os'; vex.dialog.alert('Test'); </script>