There is some problem with loading file include/epesi.js. Please ensure that your files have proper permissions. If your http server can read from include dir this file please enable Chrome dev tools and select tab Network. During install you should get here request for serve.php file. It should look like
Request URL:http://<your server url>/<your dir>/serve.php?f%5B0%5D=libs%2Fprototype.js&f%5B1%5D=libs%2Fjquery-1.7.2.min.js&f%5B2%5D=libs%2Fjquery-ui-1.8.21.custom.min.js&f%5B3%5D=libs%2FHistoryKeeper.js&f%5B4%5D=include%2Fepesi.js&1353685701
as you can see your EPESI requests for file include/epesi.js (end of url)
In response at the end you should get content of epesi.js file.
Please follow these steps and share what you've got.
Best regards,
Adam