[WordPress] Simple data not passing to form :(

[wmguk]

Hey Guys,

 

I'm using wordpress and attempting to pass and image name via php -

 

<?php echo do_shortcode('[popup url="http://domain.com/enquire.php?prod_id=". echo $image->alttext ."]Enquire[/popup]'); ?>

Breaks the code - the url becomes domain.com/currentpage not enquire.php

 

<?php echo do_shortcode('[popup url="http://domain.com/enquire.php?prod_id=$image->alttext"]Enquire[/popup]'); ?>

the URL shows as http://domain.com/enquire.php?prod_id=$image->alttext

 

I cannot get it to display the actual alttext output...

 

Any ideas how I can pass this info?...