Hi Mark, you may want to check this discussion which goes over the version of Rhino Integrity Server makes use of (1.5R2). The W3Schools page says this is for Javascript version 1.6 and a quick test in a trigger script tells me that "indexOf is not a function". Unfortunately it looks like it cannot be used with Integrity trigger javascript.
Please contact PTC Technical Support and inform them of your desire to see the version of Rhino updated in a future release of Integrity and they will attach you to the appropriate request.
