rem: return ((element.offsetTop+element.offsetHeight)-this.ycomp) / element.offsetHeight; 
add: return ((this.offset[1]+element.offsetHeight)-this.ycomp) / element.offsetHeight; 
context:   overlap: function(mode, element) {      if(!mode) return 0;      if(mode == 'vertical')       return ((element.offsetTop+element.offsetHeight)-this.ycomp) / element.offsetHeight;    if(mode == 'horizontal')      return ((element.offsetLeft+element.offsetWidth)-this.xcomp) / element.offsetWidth;  },
meta: 2044	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/2044/c9f2389c010ba9364a4454b45b3cedd4dd273c38/prototype.js/clean/actionpack/lib/action_view/helpers/javascripts/prototype.js