add_action( 'genesis_after_header', 'sk_top_ad' );
function sk_top_ad() {
	if ( wp_is_mobile() ) { ?>
		<!-- EM_320x100(mobile) -->
		<div id='div-gpt-ad-1427916961871-4' style='width:320px; height:100px;'>
		<script type='text/javascript'>
			googletag.cmd.push(function() { googletag.display('div-gpt-ad-1427916961871-4'); });
		</script>
		</div>
	<?php } else { ?>
		<!-- EM2_728x90 -->
		<div id='div-gpt-ad-1427916961871-0' style='width:728px; height:90px;'>
		<script type='text/javascript'>
			googletag.cmd.push(function() { googletag.display('div-gpt-ad-1427916961871-0'); });
		</script>
		</div>
	<?php }
}