rem: return tw_isGecko ? event.which : event.button; 
add: return event.which ? event.which : event.button; 
context: function tw_getEventButton(event) {    return tw_isGecko ? event.which : event.button;}
meta: 5515	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5515/24e02545b42a490e7acd2cb4e45328f823b29e40/Startup.js/clean/src/thinwire/render/web/resources/Startup.js