add:  if (isNaN(this.startOffset[0])) this.startOffset = [0, 0]; 
context:     getXValue: function () {        if (!this.available) { return 0; }        var newOffset = this.getOffsetFromParent();        return (newOffset[0] - this.startOffset[0]);    },
meta: 7801	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/7801/18128112b4ebb4c8b4075134efdb22b1d509f4c8/slider.js/buggy/src/resources-packaged/ops/javascript/yui/slider.js