What code is executed when a user deletes their uploaded photo?

[hanny137]

On the product page - if a user uploads a photo customization, the little X that appears links to the 'productUrl+deletePicture=1'

 

In product.tpl it looks like this:

<a href="{$link->getProductDeletePictureLink($product, $field.id_customization_field)|escape:'html':'UTF-8'}" title="{l s='Delete'}" >
    <img src="{$img_dir}icon/delete.gif" alt="{l s='Delete'}" class="customization_delete_icon" width="12" height="12" />
</a>

What method/function is being called to delete the picture?

I'm trying to turn this X into an ajax call to appropriately delete the picture without reloading the page so any of the other data the user has entered doesn't get deleted during the reload.

How do I get to that method to change/update it so it works with ajax?