Masonry Gallery Tool Tip

I’d like to hide the tooltip that the browser shows when mousing over the masonry gallery thumbnail images.

I’ve tried a suggestion from:

In that post its suggested to use the following function:

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function add_custom_tooltip(){
?>
<script>
jQuery(window).load(function(){
jQuery(‘a’).removeAttr(‘title’);
jQuery(‘img’).removeAttr(‘title’);
});
</script>
<?php
}
add_action(‘wp_footer’, ‘add_custom_tooltip’);

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The trouble with this solution is that in addition to removing the TOOLTIP from the small gallery thumbnail images, it unfortunatly also removes the CAPTIONS from any of the lightbox enlargements.

Is it possible the script could be modified to only affect the thumbnails and not the enlargements?