how to show only Images from content documents..Simplesearch Snippet

Hi All,

I am using the Modx Revolution and built in simplesearch snippet comes with sampledata. How can i modify searchformTpl to only show images in search result from all content documents.

When I insert image, it would have image description and title

Current searchformTpl looks like this...

<form id="ajaxSearch_form sisea-search-form" action="[[~5]]" method="[[+method:default=`get`]]">
<fieldset>
<label for="ajaxSearch_input">
<input id="ajaxSearch_input" class="cleardefault" type="text" name="[[+searchIndex]]" value="[[+searchValue]]" />
</label>
<label for="ajaxSearch_submit">
<input id="ajaxSearch_submit" type="submit" value="[[%sisea.search? &namespace=`sisea` &topic=`default`]]" />
</label>
</fieldset>
</form>