WP conditional for spitting out html
<?php if (( is_page(3483) || is_page(3485) || is_page(3490) || is_page(3486) )) {
echo '<img height="1" width="1" style="border-style:none;" alt="" src="//insight.adsrvr.org/track/conv/?adv=glzax3m&ct=0:qwjeosk0&fmt=3"/>';
}
?>