Hi All,

I'm struggling with what is obviously a very simple task, I can't figure out why my xslt select won't work.

Following the examples from these threads: http://our.umbraco.org/forum/developers/xslt/21244-Multiple-variables-in-select, http://our.umbraco.org/forum/developers/xslt/20270-Multiple-parameters-in-xlst-select I'm using the following code to output the value of a particular page property, and choosing which property dynamically though a parameter to my macro.

I have the following XSLT:

<xsl:param name="currentPage"/>
<xsl:param name="heroImage" select="macro/heroImage"/>
<xsl:template match="/">  
  <div id="hero-credits">
    <xsl:variable name="mediaId" select="$currentPage/* [name() = concat('heroImage', $heroImage)]" />
    <xsl:variable name="media" select="umbraco.library:GetMedia($mediaId, 0)"/>
    <a href="{$media/creditLink}" title="{$media/credit}">
      <xsl:value-of select="$media/credit" />
    </a>
  </div>
</xsl:template>

Which is connected to a macro with a text parameter "heroImage" and is called from my template like this:

<umbraco:Macro heroImage="[@image], 1" Alias="HeroCredits" runat="server"></umbraco:Macro>

For now I'm just worrying about the default case, rather than getting the value from the Request. I've checked the parameters with xsl:copy-of statments and they're getting passed in correctly, and I've checked my xsl by making $mediaId hard-coded, and it all works fine, however, whenever I try the full thing I get the following error on saving my xslt:

System.OverflowException: Value was either too large or too small for an Int32.

It's definately coming from the statement that's assigning a value to $mediaId, but I can't for the life of me figure out why? What's the glaringly obvious mistake I've made?

Thanks,

Steve