How to get it work with qTranslate?

Hello there!

I’m using this Multiple search plugin with qtranslate. My normal search works fine when i added this hidden field:

<form id="searchform" method="get" action="<?php echo $_SERVER['PHP_SELF']; ?>">
<input type="hidden" id="lang" name="lang" value="<?php echo qtrans_getLanguage(); ?>"/>
<input type="text" name="s" value="<?php _e("Enter partial address, keywords","language"); ?>" onclick="this.value='';" class="search_input" />
<input type="submit" class="submitt_button" value="Go" alt="[Submit]" name="submit" title="<?php _e("Search Our Properties","language"); ?>" />
</form>

Any tips how i could do the same with this Multiple search plugin? I want my language to stay and not being changed to default after i search…