rem: return ((offset/this.trackLength) * (this.range.end - this.range.start)) + this.range.start; 
add: return ((offset/(this.trackLength-this.handleLength) * (this.range.end-this.range.start)) + this.range.start); 
context:   translateToValue: function(offset) {    return ((offset/this.trackLength) * (this.range.end - this.range.start)) + this.range.start;  },
meta: 4973	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/4973/5fa81acc3e4e722f3224e6b94fd578c055cba661/slider.js/buggy/src/slider.js