Banner position...

So, I've had GoogleAds running in the top banner area of our site correctly for around a month. The code looks like this:




<div style="margin-left: 51%;margin-top: -96px;">

<script type="text/javascript"><!--
google_ad_client = "pub-XXXXXXXXXXXXXXXXXX";
/* Top banner - 468x60 */
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>

</div>



...however, I have another banner ad in the top banner space with the following code (only difference is that it's an image and not GoogleAds code) but it shows in Internet Explorer much lower than the first banner!! Any ideas??




<div style="margin-left: 51%;margin-top: -96px;">

<img src="http://www.XXXXXXXXXX.com/banner ad.png" alt="advertising" width="468" height="60" border="0" longdesc="http://www.XXXXXXXXX.com"></a>

</div>