Form API submit with AJAX removes wrapper element?
If you don't want to 'replace' element with id 'view-cont', use another 'method', like:

'method' =&gt; 'append',


And if you in fact want to replace it, modify fung_filter_form_callback to make it return div with that ID again - that way you will replace original div with another div of the same ID, and will be able to repeat that process.