[xsl] xsl:if

Hello. I am new to XSL and am having a problem with using xsl:if. I have passed a parameter (id) from some javascript into the XSL stylesheet. I know this works because I can output the value of ID in the html produced. However what I want is to only output html if the ID value in the XML matches the value of ID passed. I have tried the xsl:if in a variety of places and had no luck. Looking through FAQ and deja I have not found anyone doing this so I am starting to think I have got the wrong end of the stick fairly badly. Any help would be much appreciated, even if it is to tell me where to look to learn how to do this. I realise that ID should possibly be the parent to the other elements, but started to get the feeling that was not necessarily true. Sorry in advance if this is too stupid a question. I am using the XSLTProcessor in Firefox 1.02

The XML looks like this
------------------------------------------------------
<npcs>
<char>
<id>28</id>
<name>Bonrist</name>
<location>Vanard</location>
<charinfo>Shemtaa</charinfo>
<prof/>
<realprof>Thief</realprof>
<localknown>0</localknown>
<countryknown/>
<gminfo>hello</gminfo>
</char>
-
   <char>
<id>29</id>
<name>Dynl</name>
<location>Vanard</location>
<charinfo>Elf</charinfo>
<prof/>
<realprof>Thief</realprof>
<localknown>0</localknown>
<countryknown/>
<gminfo>hello</gminfo>
</char>
</npcs>
---------------------------------------------------
The XSL I am using looks like this
<xsl:stylesheet version="1.0"
   xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
<!-- root node-->
<xsl:output method="html"/>
<xsl:param name="id"/>
<xsl:template match="/">
<html>
<body>
<h2>Character info</h2>
<xsl:apply-templates />
</body>
</html>
</xsl:template>

<!-- into the npc node -->
<xsl:template match="npcs">
<table width="75%" border="1">

     <xsl:apply-templates>
      </xsl:apply-templates>

</table>

</xsl:template>



<xsl:template match="char">
<xsl:if test="$id=<xsl:value-of select="id" />
 <tr>
   <td>Name :</td>
   <td colspan="3"><xsl:value-of select="name" /></td>
 </tr>
 <tr>
   <td>Known Profession :</td>
   <td><xsl:value-of select="prof" /></td>
   <td>Real Profession :</td>
   <td><xsl:value-of select="realprof" /></td>
 </tr>
 <tr>
   <td>Public Information :</td>
   <td colspan="3"><xsl:value-of select="charinfo" /></td>
 </tr>
 <tr>
   <td>Private Information :</td>
   <td colspan="3"><xsl:value-of select="$id" /></td>
 </tr>
 <tr>
   <td>Address Info :</td>
   <td  rowspan="2"></td>
   <td>Local Fame Rating :</td>
   <td><xsl:value-of select="localknown" /></td>
 </tr>
 <tr>
   <td></td>
   <td>Country Fame Rating :</td>
   <td><xsl:value-of select="countryknown" /></td>
 </tr>
</xsl:if>
</xsl:template>

</xsl:stylesheet>

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