How to place two ads adsense side-by-side?

 How do I place ads side-by-side?
I'll tell you the easier way, Just check the red coding below.You can understand,

<table border=0><tr><td valign=top>

<script type="text/javascript"><!--
google_ad_client = "pub-123456789";
/* 234x60, created 2/20/09 */
google_ad_slot = "1599632606";
google_ad_width = 234;
google_ad_height = 60;
//-->
</script>
</td><td valign=top>

<script type="text/javascript"
src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
</script><span style="float:right; "><script type="text/javascript"><!--
google_ad_client = "pub-123456789";
/* 468x60, created 2/20/09 */
google_ad_slot = "4145916404";
google_ad_width = 468;
google_ad_height = 60;
//-->
</script>
<script type="text/javascript"
src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
</script>
</td></tr></table>