rem: valueL += element.scrollLeft || 0; 
add: valueL += element.scrollLeft || 0; 
context:   realOffset: function(element) {    var valueT = 0, valueL = 0;    do {      valueT += element.scrollTop  || 0;      valueL += element.scrollLeft || 0;       element = element.parentNode;    } while (element);    return [valueL, valueT];  },
meta: 3283	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/3283/9867ca01ad65827d23c0bf6cc14d8a64137e927d/prototype.js/buggy/tracks/public/javascripts/prototype.js