[Zope] properties of ZPT

Hi, I've got a small thing with ZPT here. My template got a property "activetab", which represents the number of the active tab in the template. This affects mainly the coloring of table headers. My problem is how to change this property by clicking on a link within one of the tabs?! My first thought was to use a script, but how do I tell the script which tab/link was clicked on? Or can I directly change the property by linking to the template? Andreas -- Try to have as good a life as you can under the circumstances.