If you want to use HTML as description in Zend Forms use :

$name = new Zend_Form_Element_Text('fullname'); $name-&gt;setLabel('Full name:'); $name-&gt;setDescription('<a class="thickbox" title="Please choose customer" href="/customers/indexajax?KeepThis=true&amp;TB_iframe=true&amp;height=600&amp;width=1100">Find customer</a>');

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