this script don't save utf-8 character in database

I installed osticket in:

http://www.itechiran.com/support(http://www.itechiran.com/support)

we want use farsi language

but in all form after save all character show ?

please check this page:

http://www.itechiran.com/support(http://www.itechiran.com/support)

and see the title bar of the page

I insert 2 character with persian character but we see " ?? "

this script is very nice and I want use it please help me if solve this mater is posible.

thanks