google webfonts (recommended)
vist : http://www.google.com/webfonts
choose your font, click on easy use
copy this type of code
Code:
<link href='http://fonts.googleapis.com/css?family=Margarine' rel='stylesheet' type='text/css'>

to your joomla template (add inside <head> </head>)
now simply call the font by using this
font-family: 'Margarine';

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http://www.google.com/fonts/#QuickUs.../Script:arabic

Google Web Font URL:
http://fonts.googleapis.com/css?fami...&subset=arabic


Google Web Font Family:
'Amiri', serif

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الخط فى الموقع حيتغير من خط اجنبى معرب بشكل سىء الى خط عربى رائع .