Viv,

It's a parameter (a string) sent to the javascript function.

function FilterData( cFilter )
{
filterBy.value = 'VFPData/dbservers[contains( servname, $cFilter )]';
PopulateDocument();
}

it's called from inside the page:

$cFilter throws the same error.

<a href="javascript:FilterData('prod')">filter</a>

>

VFPData/dbservers[contains( servname, cFilter )]

>
>Is cFilter an xsl Variable or Param ? If so should be: $cFilter