Hi,

> I am trying to comparing to see is a string is null,

There is no concept of "null" in XPath or XSLT.

> I have a param named userid, i want to check to see if
> '$userid' is not null.
>
> I tried <xsl:if test="$userid!=''>, this does'nt seem
> to help.

See <http://www.w3.org/TR/xpath#booleans> how comparisons work in XPath.

Anyhow, you can just use

  <xsl:if test="$userid">

Cheers,

Jarno - DE/VISION: Endlose Traume

 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list