rem: return event.offsetX; 
add: return event.offsetX; 
context: function tw_getEventOffsetX(event) {    if (tw_isGecko) {        return event.layerX;    } else {        return event.offsetX;// + tw_BORDER_WIDTH;    }}
meta: 5515	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5515/f1782c774313ba79c127ba5da30580c5ce1f4c32/Startup.js/clean/src/thinwire/render/web/resources/Startup.js