How to make previous_post_link into an image [duplicate]

Question

I would like to make the previous and next post link into an image instead of a link text e.g.

<a href="%link"><img src=""  /> </a>

so whatever the size of the image it would be clickable i tried adding a css through filter but the image just stays as a background(not clickable)

function post_left_attributes($output) {
    $injection = 'class="arrow_left"';

    return str_replace('<a href=', '<a '.$injection.' href=', $output);
}

function post_right_attributes($output) {
    $injection = 'class="arrow_right"';
    return str_replace('<a href=', '<a '.$injection.' href=', $output);
}

Answer 1

You can customize previous_post_link like this

previous_post_link('%link','<img src="link_to_image"/>');