rem: return event.target || event.srcElement; 
add: return $(event.target || event.srcElement); 
context:   element: function(event) {    return event.target || event.srcElement;  },
meta: 7608	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/7608/d556a0875c83645645bd2067594241546d26d052/prototype.js/buggy/web/js/prototype.js