function add_google_remarketing(){
?>
<script type="text/javascript">
/* <![CDATA[ */
var google_conversion_id = 956731943;
var google_custom_params = window.google_tag_params;
var google_remarketing_only = true;
/* ]]> */
</script>
<script type="text/javascript" src="//www.googleadservices.com/pagead/conversion.js">
</script>
<noscript>
<div style="display:inline;">
<img height="1" width="1" style="border-style:none;" alt="" src="//googleads.g.doubleclick.net/pagead/viewthroughconversion/956731943/?value=0&amp;guid=ON&amp;script=0"/>
</div>
</noscript>
<?php
}
add_action('wp_footer', 'add_google_remarketing');