I have a XML file listed below.  I want to call a php with a url
variable such as (request.php?id=1,show,true using xmlhttprequest).  I
should be able to do this myself but I am having trouble.  I have the
xmlhttprequest done but I need the page to display only one record in
XML.  Can someone help me finish the request.php file.  It should be
easy for an experienced developer.  When finished the php file should
return the record by the id # when submitted as request.php?id=2.  The
output should be in xml not text.  It should work just like this page
http://209.123.133.210/ad.php?ad=1999

[xml.xml]
<?xml version="1.0" ?> 
<addresses>
<address>
<id>1</id>
<name>John Doe 1</name>
<address>1 main street</address>
<city>new york</city>
<state>new york</state>
<zipcode>00000</zipcode>
</address>
<address>
<id>2</id>
<name>John Doe 2</name>
<address>2 main street</address>
<city>new york</city>
<state>new york</state>
<zipcode>00000</zipcode>
</address>
<address>
<id>3</id>
<name>John Doe 3</name>
<address>3 main street</address>
<city>new york</city>
<state>new york</state>
<zipcode>00000</zipcode>
</address>
<address>
<id>4</id>
<name>John Doe 4</name>
<address>4 main street</address>
<city>new york</city>
<state>new york</state>
<zipcode>00000</zipcode>
</address>
<address>
<id>5</id>
<name>John Doe 5</name>
<address>5 main street</address>
<city>new york</city>
<state>new york</state>
<zipcode>00000</zipcode>
</address>
<address>
<id>6</id>
<name>John Doe 6</name>
<address>6 main street</address>
<city>new york</city>
<state>new york</state>
<zipcode>00000</zipcode>
</address>
<address>
<id>7</id>
<name>John Doe 7</name>
<address>7 main street</address>
<city>new york</city>
<state>new york</state>
<zipcode>00000</zipcode>
</address>
<address>
<id>8</id>
<name>John Doe 8</name>
<address>8 main street</address>
<city>new york</city>
<state>new york</state>
<zipcode>00000</zipcode>
</address>
<address>
<id>9</id>
<name>John Doe 9</name>
<address>9 main street</address>
<city>new york</city>
<state>new york</state>
<zipcode>00000</zipcode>
</address>
</addresses>

[file request.php] (to be completed)