Here's my XSL List view code I need help with:

<xsl:template match="udt:Data" mode="list">
  <xsl:param name="from" select="1" />
  <xsl:param name="to" select="count(*)" />
  <xsl:variable name ="imgColumn" select="//udt:Fields[udt:FieldType='Image'][1]/udt:ValueColumn"/>
  <xsl:variable name ="titleColumn" select="//udt:Fields[udt:FieldType='String'][1]/udt:ValueColumn"/>
  <xsl:variable name="id" select="udt:UserDefinedRowId"/>
  <xsl:if test="position() &gt; $from and position() &lt; $to">
   <table cellspacing="0" cellpadding="4" width="400" style="border: silver 1px solid; border-collapse: collapse;">
    <tr>
     <td>
      <table cellspacing="0" cellpadding="2" border="0">
       <tr>
        <td>
         <xsl:call-template name="EditLink" />
        </td>
        <td valign="middle">
         <xsl:value-of select="//udt:Data[udt:UserDefinedRowId=$id]/*[name()=$imgColumn]" disable-output-escaping="yes"/>
        </td>
        <td>
         <table cellspacing="0" cellpadding="2" border="0" style="padding-left:2px;">
          <tr>
           <td>
            <strong>
             <xsl:value-of select="//udt:Data[udt:UserDefinedRowId=$id]/*[name()=$titleColumn]" disable-output-escaping="yes"/>
            </strong>
           </td>
          </tr>
          <tr>
           <td>
            <xsl:value-of select="udt:City" disable-output-escaping="yes" />, <xsl:value-of select="udt:State" disable-output-escaping="yes" />, <xsl:value-of select="udt:Country" disable-output-escaping="yes" />
           </td>
          </tr>
          <tr>
           <td>
             <xsl:call-template name="ViewProfile" /><xsl:call-template name="ViewWebsite" />
           </td>
          </tr>
         </table>
        </td>
       </tr>
      </table>
     </td>
    </tr>
   </table>
   <br />
  </xsl:if>
 </xsl:template>
<xsl:template name="ViewWebsite">
  <a target="_blank" href="{udt:Website}">
    <img border="0" width="12" height="12" alt="website" src="{//udt:Context/udt:ApplicationPath}/images/icon_solutions_16px.gif" /><>View Website</font>
  </a>
</xsl:template>

Please try  {udt:Website_UDT_Url}

Hidden columns are discribed inside documentation. There are also links to the hidden columns help inside manage udt and Token2Xsl editor. You can query the XML representation of the UDT data using the action menu.