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--- navigation.xsl.orig 2010-10-16 04:14:27.000000000 +0200
+++ navigation.xsl      2011-03-01 09:26:28.000000000 +0100
@@ -123,9 +123,27 @@
     </xsl:variable>
     
     <li id="portalNavigation_{@ID}"> <!-- Each navigation menu item.  The unique ID can be used in the CSS to give each menu item a unique icon, color, or presentation. -->
-      <a id="tabLink_{@ID}" href="{$BASE_ACTION_URL}?uP_root=root&amp;uP_sparam=activeTab&amp;activeTab={position()}" title="{@name}">  <!-- Navigation item link. -->
+      <!-- NANCY2 START : DISPLAY ONLY ONE CHANNEL -->
+         <xsl:variable name="firstChanID" select="tabChannel[1]/@ID"/>
+         <xsl:choose>
+        <xsl:when test="$AUTHENTICATED='true' and normalize-space(.) != $firstChanID">
+                       <xsl:variable name="firstChanURL"><xsl:value-of select="$BASE_ACTION_URL"/>?uP_sparam=activeTab&amp;activeTab=<xsl:value-of select="position()"/>&amp;uP_root=<xsl:value-of select="$firstChanID"/></xsl:variable>
+                       <a id="tabLink_{@ID}" href="{$firstChanURL}" title="{@name}">  <!-- Navigation item link. -->
+                               <span><xsl:value-of select="@name"/></span>
+                       </a>
+               </xsl:when>
+        <xsl:otherwise>
+                       <a id="tabLink_{@ID}" href="{$BASE_ACTION_URL}?uP_root=root&amp;uP_sparam=activeTab&amp;activeTab={position()}" title="{@name}">  <!-- Navigation item link. -->
+                               <span><xsl:value-of select="@name"/></span>
+                       </a>
+               </xsl:otherwise>
+      </xsl:choose>
+      <!--
+      <a id="tabLink_{@ID}" href="{$BASE_ACTION_URL}?uP_root=root&amp;uP_sparam=activeTab&amp;activeTab={position()}" title="{@name}">
         <span><xsl:value-of select="@name"/></span>
       </a>
+      -->
+      <!-- NANCY2 END : DISPLAY ONLY ONE CHANNEL -->     
       <xsl:if test="@activeTab='true' and $CONTEXT='sidebar'"> <!-- If navigation is being rendered in the sidebar rather than as tabs, call template for rendering active menu item's submenu. -->
         <xsl:call-template name="subnavigation">
           <xsl:with-param name="CONTEXT" select="'subnav'"/>
@@ -138,8 +156,10 @@
           <xsl:with-param name="TAB_POSITION" select="position()"/>
         </xsl:call-template>
       </xsl:if>
-      <xsl:if test="$USE_AJAX='true' and $AUTHENTICATED='true' and @activeTab='true' and not($PORTAL_VIEW='focused')"> <!-- If navigation is being rendered in the sidebar rather than as tabs, call template for rendering active menu item's submenu. -->
-        <xsl:call-template name="preferences.editpage"/>
+      <!-- NANCY2 END : DISPLAY ONLY ONE CHANNEL -->
+         <!-- <xsl:if test="$USE_AJAX='true' and $AUTHENTICATED='true' and @activeTab='true' and not($PORTAL_VIEW='focused')"> --><!-- If navigation is being rendered in the sidebar rather than as tabs, call template for rendering active menu item's submenu. -->
+      <xsl:if test="$USE_AJAX='true' and $AUTHENTICATED='true' and @activeTab='true'">
+         <xsl:call-template name="preferences.editpage"/>
       </xsl:if>
     </li>

dans le template : <xsl:template name="columns">

remplacer : <xsl:apply-templates select="channel"/>
par : <xsl:apply-templates select="channel[1]"/>