Using the image caption as an alt tag

[pipedragon72]

I've been trying to change the product-list.tpl so that the image alt tag uses the caption rather than the product name:

getImageLink($product.link_rewrite, $product.id_image, 'home')}" alt="{$product.legend|escape:'htmlall':'UTF-8'}" title="{$product.legend|escape:'htmlall':'UTF-8'}" width="{$homeSize.width}" height="{$homeSize.height}" />

Is there any way of changing the code: {$product.legend|escape:'htmlall':'UTF-8'} to use the content of the image caption?