Tricky XPath search using translate()

Thanks in advance.
I have a rather large MSXML Dom object with this structure:
<DStblDown>
<FullName>Leroy Brown</FullName>
<Address>121 Mean st</Address>
<City>Vegas</City>
<Country>USA</Country>
<Email>bbbb@bbb</Email>
<Phone>212545</Phone>
<Comments>Bad</Comments>
</DStblDown>
under a root node of <NewDataSet>
I am storing a set of customers which needs to be searched on the client side.
If I retrieve a variable 'selection' from the user I can perform a case sensitive 'Full Name' search using:

"NewDataSet/DStblDown[FullName!text() ='"+selection+"']/FullName";

However, the problem is I want (have) to perform a non-case sensitive search for 'Full Name'. I know this is possible using the translate() method but it has got me stumped!
Can anyone help at all?
Cheers

... translate($translateMe, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz') ...

Thanks for that Matt.
One remaining problem (I'm having a duh moment)
I cannot place the translate() method into :

NewDataSet/DStblDown[FullName!text() ='"+selection+"']/FullName

and get the damn thing to work! Where would the translate you suggested fit in and still parse OK?
Cheers - Mike

Sorry Matt - methinks I have posted this twice!
One remaining problem (I'm having a duh moment)
I cannot place the translate() method into :

NewDataSet/DStblDown[FullName!text() ='"+selection+"']/FullName

and get the damn thing to work! Where would the translate you suggested fit in and still parse OK?
Cheers - Mike

Will this work?

HI there
ran the code but got this error (same error as I have been getting repeatedly in past attempts):

msxml3.dll: Unknown method.

NewDataSet/DStblDown[FullName!text() = -->translate('Leroy Brown'<--, 'ABC', 'abc')]/FullName

Cheers - Mike

Try dropping the !text()

What happens now?

Hi Matt
Finally got it sussed. Thanks for your help - set me on the correct path (sorry about the pun)
I had to use: domObject.setProperty("SelectionLanguage", "XPath");
MSXML would not accept the translate() method without this - who knows!

The workin path is now:
"NewDataSet/DStblDown/FullName[translate(text(), 'abc...', 'ABC..;')='"+selection.toUpperCase()+"']";

Thanks again
Cheers - Mike