how can i change the image of my blog title to a title?

<b:with value='data:post.featuredImage.isResizable ? resizeImage(data:post.featuredImage, 240, &quot;1:2&quot;) : data:post.thumbnail' var='image'>
    <img class='full' expr:alt='data:post.title' expr:src='data:image'/>
    </b:with>