using params in xsl IF element

hi, i want to evaluate the value of a parameter in an IF element, the code goes following which does not work:
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<xsl: param name="msgid" />
<xsl:for-each select="//message">
<xsl:if test="@id=$msgid">
......... processing.......
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where id is an attribute of all message element in the xml. basically i would like the code to perform certain processing when the message id = the given msgid. hav tried test="@id=[$msgid]", test="[id=$msgid]" all do not work. what should i write here?
thanks alot!