我现在是这样添加adsense的：

<script type="text/javascript"><!--
google_ad_client = "pub-1791301821614297";
/* Ask, 200x200, created 1/5/10 */
google_ad_slot = "3677119798";
google_ad_width = 200;
google_ad_height = 200;
//-->
</script>
<script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
</script>

但是无法控制adsense的位置，该如何操作呢？