[xsl] compare two lists of values question

["Friedlander, Hal" <Hal@xxxxxxxxxxxx>]

I'm assuming this is kind of a novice level question.
I need to compare two lists of values and display the value of any name
element not in both lists.
The xml is like this:
<Merchants>
<USMerchants>
	<name>store1</name>
	<name>store2</name>
	<name>store3</name>
	<name>store4</name>
	<name>store5</name>
	<name>store6</name>
</USMerchants>
<UKMerchant>
	<name>store1</name>
	<name>store2</name>
	<name>store3</name>
	<name>store4</name>
	<name>store5</name>
	<name>store99</name>
</UKMerchant>
</Merchants>

Using MSXML3 parser.

Thanks in advance,
Hal Friedlander

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