[SOLVED] use greek Language

hello ,
i have the same problem with this guy in this post
http://forum.freenicetemplates.com/showthread.php?t=299

but i have greek characters

could you please help me?

this is a sample of my custom.xml file

<header>
<text_header_h1 x_pos="30" y_pos="35" size="19" letter_spacing="0" text_color="FFFFFF"> αρχική </text_header_h1>
<text_header_h2 x_pos="30" y_pos="60" size="10" letter_spacing="2.3" text_color="FFFFFF">YOUR OWN SLOGANS AND IMAGES</text_header_h2>
<image blur="no">images/flashimages/header1.jpg</image>
</header>
<header>
<text_header_h1 x_pos="600" y_pos="265" size="19" letter_spacing="0" text_color="000000">YOUR WAY TO SUCCESS</text_header_h1>
<text_header_h2 x_pos="600" y_pos="290" size="10" letter_spacing="2.3" text_color="000000">YOUR OWN SLOGANS AND IMAGES</text_header_h2>
<image blur="no">images/flashimages/header2.jpg</image>


thanks