You are looking at the HTML representation of the XML format.
HTML is good for debugging, but is unsuitable for application use.
Specify the format parameter to change the output format.
To see the non HTML representation of the XML format, set format=xml.
See the complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query-continue>
    <allimages aistart="2013-07-22T04:48:53Z" />
  </query-continue>
  <query>
    <allimages>
      <img name="File_perms.png" timestamp="2013-07-25T20:17:01Z" user="Lamphost" url="http://kb.lamphost.com/images/1/1f/File_perms.png" descriptionurl="http://kb.lamphost.com/index.php?title=File:File_perms.png" ns="6" title="File:File perms.png" />
      <img name="Site_manager_mysql.png" timestamp="2013-07-24T18:57:29Z" user="Lamphost" url="http://kb.lamphost.com/images/e/e2/Site_manager_mysql.png" descriptionurl="http://kb.lamphost.com/index.php?title=File:Site_manager_mysql.png" ns="6" title="File:Site manager mysql.png" />
      <img name="Phpmyadmin2.png" timestamp="2013-07-24T18:35:11Z" user="Lamphost" url="http://kb.lamphost.com/images/5/57/Phpmyadmin2.png" descriptionurl="http://kb.lamphost.com/index.php?title=File:Phpmyadmin2.png" ns="6" title="File:Phpmyadmin2.png" />
      <img name="Phpmyadmin1.png" timestamp="2013-07-24T18:34:51Z" user="Lamphost" url="http://kb.lamphost.com/images/2/22/Phpmyadmin1.png" descriptionurl="http://kb.lamphost.com/index.php?title=File:Phpmyadmin1.png" ns="6" title="File:Phpmyadmin1.png" />
      <img name="Webstats.png" timestamp="2013-07-23T21:52:09Z" user="Lamphost" url="http://kb.lamphost.com/images/c/cc/Webstats.png" descriptionurl="http://kb.lamphost.com/index.php?title=File:Webstats.png" ns="6" title="File:Webstats.png" />
      <img name="Site_manager.png" timestamp="2013-07-23T21:31:41Z" user="Lamphost" url="http://kb.lamphost.com/images/3/36/Site_manager.png" descriptionurl="http://kb.lamphost.com/index.php?title=File:Site_manager.png" ns="6" title="File:Site manager.png" />
      <img name="Pass_protect.png" timestamp="2013-07-23T20:15:19Z" user="Lamphost" url="http://kb.lamphost.com/images/c/cf/Pass_protect.png" descriptionurl="http://kb.lamphost.com/index.php?title=File:Pass_protect.png" ns="6" title="File:Pass protect.png" />
      <img name="Hosting_manager.png" timestamp="2013-07-23T18:22:37Z" user="Lamphost" url="http://kb.lamphost.com/images/8/8b/Hosting_manager.png" descriptionurl="http://kb.lamphost.com/index.php?title=File:Hosting_manager.png" ns="6" title="File:Hosting manager.png" />
      <img name="Spamassassin.png" timestamp="2013-07-22T20:02:59Z" user="Lamphost" url="http://kb.lamphost.com/images/9/9b/Spamassassin.png" descriptionurl="http://kb.lamphost.com/index.php?title=File:Spamassassin.png" ns="6" title="File:Spamassassin.png" />
      <img name="Domain_manager.png" timestamp="2013-07-22T05:46:16Z" user="Lamphost" url="http://kb.lamphost.com/images/2/2d/Domain_manager.png" descriptionurl="http://kb.lamphost.com/index.php?title=File:Domain_manager.png" ns="6" title="File:Domain manager.png" />
    </allimages>
  </query>
</api>