darren, ><><><><><><><><><><><><><><><><><><><><><><><><><><><><>< > From: dn at dittodesign.co.uk > > > a regular expression search on the navigator.platform. > > er ? ><><><><><><><><><><><><><><><><><><><><><><><><><><><><>< don't sweat it. a regular expression isn't even necessary. just test for the substring "mac" within the platform property using the indexOf() method. if(navigator.platform.toLowerCase().indexOf('mac') == -1) // do something if we find the // substring "mac" in the platform // property good luck, .jeff http://evolt.org/ jeff at members.evolt.org http://members.evolt.org/jeff/