g2_language= doesn't work with external block image

I have put external block image, it works fine, except g2_language=

I have tried to put g2_language= in different places inside the block image syntax, but it doesn't work.

For example, to link to english page (french is default) :
<?php @readfile('http://photo-venise.com/gal/main.php?g2_view=imageblock.External&g2_blocks=dailyImage&g2_maxSize=250&g2_itemFrame=solid&g2_show=none&g2_linkTarget=1&g2_language=us'); ?>

Regards,

Pascal