Codigo para centrar los anuncios..

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<div id='floatLayer' style='position: absolute;height: 20px; width:10px; left:1000px; top: 17px; left: 300px;  z-index:888888888;'>
<table border='0' cellpadding='0' cellspacing='0' style=' ' width='180'>
<tr>
<td align='center' bgcolor='FFFFFF' class='Estilo_naranja' valign='top'>
<div align='right'>
<iframe frameborder='0' height='250' marginheight='0' marginwidth='0' scrolling='no' src='http://muymusica.com/2.html' width='300'></iframe>
<div style='position: absolute; top:20px; left:20px;'><a href='' onclick='return closeDiv()'><img src="http://img195.imageshack.us/img195/8887/cerrar.gif" alt="" width="10" height="10" border="0" /></a></div>
</div></td>
</tr>
</table></div>
<script>start()</script>