rem: this.deltaX =  window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft 
add: this.deltaX =  window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft 
context:   prepare: function() {    this.deltaX =  window.pageXOffset                || document.documentElement.scrollLeft                || document.body.scrollLeft                || 0;    this.deltaY =  window.pageYOffset                || document.documentElement.scrollTop                || document.body.scrollTop                || 0;  },
meta: 1782	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/1782/3f0bcc29b1d13b6ec87c6b75980c7f271e175e80/prototype.js/buggy/webapp/sandbox/scripts/prototype.js