rem: span.style.height = this.translateToPx(range.end - range.start); 
add: span.style.height = this.translateToPx(range.end - range.start + this.range.start); 
context:   setSpan: function(span, range) {    if(this.isVertical()) {      span.style.top = this.translateToPx(range.start);      span.style.height = this.translateToPx(range.end - range.start);    } else {      span.style.left = this.translateToPx(range.start);      span.style.width = this.translateToPx(range.end - range.start);    }  },
meta: 1782	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/1782/a458ebb30ee90b66048c7fd858f5f39957a9be68/slider.js/buggy/webapp/sandbox/scripts/slider.js