Im trying to determine if a document property called "linktoasp" contains a specific value if it does it needs to use an iframe with a different css class. Any ideas why this isnt working???

<xsl:choose>

<xsl:when test="string-length($currentPage/data[@alias='linkToASP']) &gt; 0">

<div style="text-align:center; border:none;">

<iframe src ="{$currentPage/data[@alias='linkToASP']}"  scrolling="no" class="IframeStyle" frameBorder="0">

   <p>Your browser does not support iframes.</p>

</iframe>

</div>

</xsl:when>

<xsl:when test="string($currentPage/data[@alias='linkToASP']) = 'http://blazes-old.sass.local/fire-place.asp'">

<div style="text-align:center; border:none;">

<iframe src ="{$currentPage/data[@alias='linkToASP']}"  scrolling="no" class="IframeStyleSpecialOffers" frameBorder="0">

   <p>Your browser does not support iframes.</p>

</iframe>

</div>

</xsl:when>

<xsl:otherwise>

</xsl:otherwise>

</xsl:choose>