How to eliminate the double element ...

Subject: How to eliminate the double element ...
From: Éric Riblair <eriblair@xxxxxxxxxxxx>
Date: Mon, 28 Jun 1999 16:01:49 -0400
Here I want to select the FCOLOR attribute for each element ... and display only one time each color found in the XML file ...
Does anyone know a way to do this ???
Here is the context: 

<xsl:for-each select="SgPlantTypes/SgPlantType" order-by="@FCOLOR">
<DIV CLASS="listItem">
<A TARGET="weedsFCList">
<xsl:attribute name="HREF" >
weedsFCList.asp?color=<xsl:value-of select="@FCOLOR" />
<xsl:value-of select="@FCOLOR"/>

Thanks in advance for any answer,
Éric Riblair,
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