[XeTeX] xetex arabic fonts issue

[Abdulrahman Al-Abdusalalm]

After running xetex on a document to test a new arabic opentype font I got
a final pdf document with completely mixed up characters (brought from the
wrong codepoints and with wrong positioning). You can inspect the output
in the file attached. The source looks like:

\TeXXeTstate=1
> \everypar={\setbox0=\lastbox \beginR \box0 }
> %\input testfontavailability
> %\font\taha="KFGQPCUthmanTahaNaskh:script=arab" at 14pt
> \font\taha="KFGQPCUthmanTahaNaskh"
> \taha
> %\char"0628\char"0633\char"0645
> %\vskip12pt
> \centerline{\beginR
> بسم الله الرحمن الرحيم
> \endR}
> الحمد لله رب العالمين، والصلاة والسلام على أشرف المرسلين سيدنا محمد وعلى
> آله وصحبه أجمعيــن،
> أما بعد
> \bye
>

I will appreciate any kind suggestions?

-- 
Abdulrahman AAl Abdulsalam
Assistant Lecturer - IT Department
College of Applied Science
P.O. Box 699
Nizwa, 611
Oman
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