i m developing one site using wordpress deepfocus theme for the reason that i wish to show header in hebrew text but when i change title of header links in hebrew then it cannot show any factor (e.g basically change The place to find " לשוב " it dont display on front-end.

Remember that you are coping with encoding on the server side and client side.

The php manual has a lot of character encoding functions. It certainly is helpful employed in UTF-8: http://php.net/manual/en/function.utf8-encode.php

Also, if you have never witnessed this, it's worth a read. http://www.joelonsoftware.com/articles/Unicode.html

Make sure that you are delivering the right character set towards the browser. (Right click, View Page Info in Opera)

When the encoding is anything apart from UTF-8, add this for your header:

header('Content-Type: text/html; charset=UTF-8');