How to write xml files in advertising controls

The full text of xml is as follows:

<Advertisements>
<Ad> 
<ImageUrl>ggao/1.gif</ImageUrl> 
<NavigateUrl>http://www.microsoft.com</NavigateUrl> 
<AlternateText>Alt Text</AlternateText> 
<KeyWord>Computers</Keyword> 
<ImPRessions>80</Impressions> 
</Ad>
<Ad> 
<ImageUrl>ggao/2.gif</ImageUrl> 
<NavigateUrl>http://www.microsoft.com</NavigateUrl> 
<AlternateText>Alt Text</AlternateText> 
<Keyword>Computers</Keyword> 
<Impressions>80</Impressions> 
</Ad>
<Ad> 
<ImageUrl>ggao/3.gif</ImageUrl> 
<NavigateUrl>http://www.microsoft.com</NavigateUrl> 
<AlternateText>Alt Text</AlternateText> 
<Keyword>Computers</Keyword> 
<Impressions>80</Impressions> 
</Ad>
</Advertisements>

You can paste it directly and pull it. Change the image address to

<Keyword>Computers</Keyword>

and you can remove it

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