<style type="text/css">
.adslot_1 {
  width: 320px; height: 50px;
}
@media (min-width:500px) { .adslot_1 {
  width: 468px; height: 60px;
}}
@media (min-width:800px) { .adslot_1 {
  width: 728px; height: 90px;
}}
</style>

<ins class="adsbygoogle adslot_1" style="display:inline-block;" data-ad-client="ca-pub-1234" data-ad-slot="5678"></ins>
<script async src="http://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
<script>(adsbygoogle = window.adsbygoogle || []).push({});</script>

<script type="text/javascript"><!--
google_ad_client = "ca-pub-xxxxxxxxxxxxxxxxxx";
function getClientWidth()
{
return document.compatMode=='CSS1Compat' && !window.opera?document.documentElement.clientWidth:document.body.clientWidth;
}

if (getClientWidth() > yyyyy)
{ 
google_ad_slot = "xxxxxxxxxx";
google_ad_width = 728;
google_ad_height = 90;
}
else 
{
google_ad_slot = "xxxxxxxxxx";
google_ad_width = 468;
google_ad_height = 60;
}
//-->
</script>
<script type="text/javascript"
src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
</script>