ranslation ready theme

Hi, i am finding some trouble to localize a theme to make it translation ready with .po and .mo files.

I added this line in the functions.php

load_theme_textdomain( ‘thethemename’, $template_directory . ‘/lang’ );

if the code for the menus in my header goes like this. which strings do i have to change and how?

<div class=”menu_cont”>
<!–

• Home
• About
• Blog
• Contact

–>
<?php wp_nav_menu(‘menu=header_menu&container=false&menu_id=menu’, ”); ?>
</div><!–//menu_cont–>
<div class=”clear”></div>
</div><!–//header_top–>

<div id=”header”>

<?php if(get_option($shortname.’_custom_logo_url’,”) != “”) { ?>
“><img src=”<?php echo stripslashes(stripslashes(get_option($shortname.’_custom_logo_url’,”))); ?>” class=”logo” />
<?php } else { ?>
“><img src=”<?php bloginfo(‘stylesheet_directory’); ?>/images/logo.png” class=”logo” />
<?php } ?>

<div id=”header_menu”>
<!–

• IIllustration
• Ink
• Abstract
• Mix Media

–>
<?php wp_nav_menu(‘menu=category_menu&container=false&menu_id=menu’, ”); ?>
<div class=”clear”></div>
</div><!–//header_menu–>
<div class=”clear”></div>
</div><!–//header–>
<div id=”content”>

thanks for the help indvance