XSLT question

[trandd]

<?xml version="1.0" encoding="UTF-8"?>
<OMDefault xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<PrintDollarsAndCents>X</PrintDollarsAndCents>
<MailAddrLine1>Add1</MailAddrLine1>
<MailAddrLine2>Add2</MailAddrLine2>
</OMDefault>

I would like to have an XSLT to transform the XML to this

<?xml version="1.0" encoding="UTF-8"?>
<OMDefault xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<PrintDollarsAndCents>Y</PrintDollarsAndCents>
<MailAddrLine1>Add1</MailAddrLine1>
<MailAddrLine2>Add2</MailAddrLine2>
</OMDefault>

Please notice the 'X' gets transformed to 'Y' if the attribute is PrintDollarsAndCents and its value is 'X' Could someone please help me with this? As I am very new to this XSLT thing.

Thank you in advance.