lightbox in php load with jumi (joomla)

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Hi,

I use Jumi with Joomla 1.5.22. I have an external php file wich is working well. But, I would like to include a lightbox effect on my pictures :

<div align="center"> <a href="<?php echo $image1;?>" rel="lightbox" title="<?php echo $name1;?>"><img src=<?php echo $image2; ?> width="100" height="100" /></div></a>

But, this code is not working... where is my error please ?

Best regards