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: 742	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/742/3f913f897829fb026ef98df2d57f8da94ee5339d/prototype.js/buggy/public/javascripts/prototype.js