在AdRotator控件中为什么显示不了？

[broom]

请问各位大哥，在AdRotator控件中为什么显示不了？附XML文件代码如下：
<Advertisements>
<Ad>
<Imagerul>
DCP_0366.JPG
</Imagerul>

<Navigaterul>
http://www.163.com/
</Navigaterul>

<Alternatetext>
saturn rings web site
</Alternatetext>

<Impressions>
1
</Impressions>

<Keyword>
staturn
</Keyword>
</Ad>

<Ad>
<Imageurl>
dcp_0371.jpg
</Imageurl>

<Navigaterul>
http://www.tom.com
</Navigaterul>

<Alternatetext>
moon explorers web site
</Alternatetext>

<Impressions>
1
</Impressions>

<Keyword>
moon
</Keyword>
</Ad>
</Advertisements>