[SOLVED] Encoding question

Hi!
English is not the native language for the system i'm working on, so i had to use some techniques to get it working. There's only thing i cannot understand:

In my .js file there's a ColumnModel description where in header i use Russian letters:

PHP Code:

---

ScheduleColumnModel = new Ext.grid.ColumnModel(
    [{
        header: '????',
        dataIndex: 'EventDate',
... 


---

And that header is shown in weird symbols!:( What is the matter?

Thank you!!


P.S.
The .js-file is in UTF-8 format.
The data from database is provided in UTF (i put mysql_query("SET NAMES UTF8") before the query).

http://extjs.com/learn/Ext_FAQ_Misc#...ious_Languages

Thank you everyone!, a solved the problem:

1) I put the following code into my script that stores all the data from my grid in my databse.

PHP Code:

---

header('Content-type: text/html; charset=UTF-8');
//
// here goes code for database connection
// 
mysql_query("SET NAMES UTF8"); 


---

2) All the files involved are in UTF-8 encoding
3) In the database all the text fields are utf8_general_ci