rem: this.deltaY =  window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop 
add: this.deltaY =  window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop 
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: 2930	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/2930/9867ca01ad65827d23c0bf6cc14d8a64137e927d/prototype.js/buggy/tracks/public/javascripts/prototype.js