How to filter and store text from an object using TruClient?

Hello,

While scripting an application with TruClient (11.52) using firefox I am running into the following problem:

I want to filter out a piece of text on a webpage and store it into a variable.

The source of the page looks like this:

<h1 id="pageTitle" class="status1">
        Case PL2500-140414-113801431 -
                            
                             Some comment here
                        
    </h1>

I want to filter out the text of the h1 element. I thought the way to do this would be to add an evaluate javascript step and add the following code to the arguments section:

var Casenr = evalXPath("//h1[@id='pageTitle']/text()");

window.alert(Casenr);

But when I run this step it gives me the following error: ReferenceError: evalXPath is not defined.

Does this mean I am only allowed to use evalXPath in the object section of a step and not in the arguments section?

How should I do this then?

Maybe it's simple, but I don't see it.

Peet