If you ever need a flag icon for your web project then the four resources below should be able to assist you with this. They should cover most of the world if not all world flags.
Fam Fam Fam
http://www.famfamfam.com/lab/icons/flags/
Icon Drawer
http://www.icondrawer.com/free.php
Custom Icon Design
http://www.customicondesign.com/free-icon/172-final-flag-icons/
Very Icon
http://www.veryicon.com/icons/flag/