disable-output-escaping="yes"

Hi:
I can use d-o-e in xsl:value-of 
<xsl:value-of select="@URLMessageId" disable-output-escaping="yes"/>
but when usin {} ....
<a href="javascript:popupid('{@URLMessageId}');">link</a>
is there any way? or should it be done using xsl:attribute?

thanks again
a.lopez

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