html table with three columns - following-sibling help?

Hi,
I'm trying to create an HTML table that contains
N-number of rows and 3-columns.
I'm getting the following error: 
"A node test that matches either NCName:* or QName was
expected"

Here's my XML:
<Base>
  <Art_group>
    <Art file_name="Cityscape"
file_uri_lores="/images/book_building/cityscape.jpg"
id="1"/>
    <Art file_name="Clock"
file_uri_lores="/images/book_building/clock.jpg"
id="2"/>
    <Art file_name="Fish"
file_uri_lores="/images/book_building/Fish.jpg" id="3"
/>
    <Art cdguser_id="0" file_name="Glass Tower"
file_uri_lores="/images/book_building/GlassTower.jpg"
id="4" />
   ...

And the XSL that I'm using:

<table class="threeCol" cellspacing="0"
cellpadding="0">
        <xsl:for-each select="/Base/Art_group/Art[position()
mod 3 = 1]">
                <tr>
                <xsl:for-each select=". |
following-sibling::/Base/Art_group/Art[position() &lt;
3]">
                        <td class="data">
                                <input type="radio" name="art_id" id="art_id"
value="{(_at_)id}"/>
                                <img src="{(_at_)file_uri_lores}" width="135"
height="184" id="coverImage" alt="{(_at_)file_name}" />
                        </td>
                </xsl:for-each>
                </tr>
        </xsl:for-each>
</table>

I believe the error is on the following-sibling line,
but not quite sure what the problem is.

thanks in advance.


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