Dynamically create Pinterest Pin button for content images

gistfile1.php

<?php
/**
 * Inline javascript
 *
 * @since 1.0.0
 */
function ja_pinterest_button() {
	?>
	<script type="text/javascript">
	jQuery(document).ready(function($) {
		if ( $( window ).width() > 700 ) {
			$('.entry-content img').each(function(index, el) {
				if ( !$(this).hasClass('no-pin') && !$(this).hasClass('alignleft') && !$(this).hasClass('alignright')  ) {
					media = $(this).prop('src');
					link = '<a href="http://pinterest.com/pin/create/button/?url=<?php echo urlencode( get_permalink() ); ?>&media=' + media + '&description=<?php echo urlencode( get_the_title() ); ?>" class="pin-it-button">Pin</a>';
					$(this).wrap('<div class="pin-image-wrapper"></div>').after(link);
				}
			});
		}
	});
	</script>
	<?php
}
add_action( 'wp_footer', 'ja_pinterest_button' );