Substituting value in XML Attribute

Hi,
    I am writing XSLT to convert one form of XML to other form. I have to
read an attribute from the source XML file and substitute the value into
Attribute value of target XML File.

example:

Source XML
    <Customer ID="A001">
    </Customer>

target XML
    <MYCustomer ID="A001">
    </MYCustomer>

If I write XSL like this
<xsl:variable name="myvar" select="@ID"/>
<MYCustomer ID="$myvar">
</MYCustomer>

the result is comming as
    <MYCustomer ID="$myvar">
    </MYCustomer>

    But I want to substitute the variable into ID attribute.
Any help would be greatly appreciated.

Thanks,
Raj.

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