MarketPress Feature : Custom Cart Images

MarketPress Custom Cart Image.php

add_action( 'wp_ajax_check_empty', 'is_cart_empty' );
add_action( 'wp_ajax_nopriv_check_empty', 'is_cart_empty' );
add_action( 'wp_footer', 'wagon_script' );

function is_cart_empty($content) {
    global $mp ;
    $products = $mp -> get_cart_contents() ;
    if (empty($products))
    	echo "Empty" ;
    else
    	echo "Full" ; 

    wp_die();
}

function wagon_script(){
?>
	<script>
	function update_wagon_image() {
	jQuery.ajax({
		type: 'POST',
		url: MP_Ajax.ajaxUrl,
		global: false,
		data: { action: 'check_empty'},
		success: function(data) {
			if("Empty" == data) {
			jQuery('.wagon a img')
			.attr('src', 'someimage.png') ;
			}
			if("Full" == data)
			{
			jQuery('.wagon a img')
			.attr('src', 'someotherimage.png') ;
			}
		}
	});
	}
	jQuery( document ).bind('ready ajaxStop', update_wagon_image );
	</script>
<?
}