1. http://www.mydomain.com/some/subdir/file.php
  2.  
  3. $.post('/some/subdir/file.php', ...);
  4.  
  5. /**
  6. * Retrieves the current root URL.
  7. *
  8. * @return string the root URL
  9. */
  10. $.fn.rootUrl = function() {
  11. var url = location.href;
  12. return url.substring(0, url.indexOf('/', 7));
  13. };