Active Tab Question

[gle041]

Hello. I have a plugin called vBH New Tabs Options which allows me to add new tabs to the navbar. One tab I have added is a link to a specific forum on my site. This plugin gives me the option to add a value defined for THIS_SCRIPT in the page it is calling, but the page this would be linking to would technically be the forumdisplay which already calls the FORUM tab as active.

Is there anyway I can add an IF statement to the forumdisplay.php that will define a differnt value for THIS_SCRIPT if on a certain forum ID so it will show that as an active page?