HELP – Wrong Blog and Site URL – Broken Now

Hi, I’ve placed http://www.urlhere.com/index.php instead of http://www.urlhere.com as the 2 urls set in the admin – now i cannot access the admin area as it cannot find the folder /index.php it seems. is there anyway of changing this back via configure files? i can’t get back into the admin to reset it as it’s broken.

Help Please?