Content Query Web Part- Image link

Hi

I want to link the rollup image (the thumbnail) on content query web part. So that the item title will link to item itself but the image will have a separate link. Is this doable, if so how?

Using the information in this blog :http://www.sharepointblog.co.uk/2012/05/fields-to-display-in-content-query-web-part/

I tried to add a custom field and called it 'ImageLink', downloaded and modified the cqwp

and then went to the XSLT, added the ImageLink variable to the style,

        <xsl:value-of select="@Imagelink"></xsl:value-of>

            <a href="{@Imagelink}">          <img src="{$SafeImageUrl}" title="{@ImageUrlAltText}">

                     <xsl:if test="$ImageWidth != ''">

                          <xsl:attribute name="width">

                            <xsl:value-of select="$ImageWidth" />

                          </xsl:attribute>

                        </xsl:if>

                        <xsl:if test="$ImageHeight != ''">

                          <xsl:attribute name="height">

                            <xsl:value-of select="$ImageHeight" />

                          </xsl:attribute>

                        </xsl:if>

                      </img> </a>

but all I can see is a string link, and the rollup image does not show up.

Am I getting it all wrong? How can I do that?

Thanks

ceren