rem: return this._getCellPosition(tw_getEventTarget(event)).join("@"); 
add: return this._getCellPosition(tw_getEventTarget(event), tw_getEventOffsetX(event)).join("@"); 
context:     getDropTarget: function(event) {        return this._getCellPosition(tw_getEventTarget(event)).join("@");    },
meta: 5515	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5515/cfa7cacc22cf44240d4fdac2a16ac0b70fe21708/GridBox.js/buggy/src/thinwire/render/web/resources/GridBox.js