rem: x >= this.offset[0] && 
add: x >= this.offset[0] && 
context:   within: function(element, x, y) {    if (this.includeScrollOffsets)      return this.withinIncludingScrolloffsets(element, x, y);    this.xcomp = x;    this.ycomp = y;    this.offset = this.cumulativeOffset(element);    return (y >= this.offset[1] &&            y <  this.offset[1] + element.offsetHeight &&            x >= this.offset[0] &&             x <  this.offset[0] + element.offsetWidth);  },
meta: 4618	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/4618/3f913f897829fb026ef98df2d57f8da94ee5339d/prototype.js/buggy/public/javascripts/prototype.js