rem: return ((this.offset[0] + element.offsetWidth) - this.xcomp) / 
add: return ((this.offset[0] + element.offsetWidth) - this.xcomp) / 
context:   overlap: function(mode, element) {      if (!mode) return 0;      if (mode == 'vertical')       return ((this.offset[1] + element.offsetHeight) - this.ycomp) /         element.offsetHeight;    if (mode == 'horizontal')      return ((this.offset[0] + element.offsetWidth) - this.xcomp) /         element.offsetWidth;  },
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