rem: if (tw_isGecko) { return event.layerX; } else { return event.offsetX; } 
add: return event.layerX ? event.layerX : event.offsetX; 
context: function tw_getEventOffsetX(event) {    if (tw_isGecko) {        return event.layerX;    } else {        return event.offsetX;    }}
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