rem: var top = parseInt(this.slider.top); 
add: var top = Position.page(evt.object)[1]; 
context:     divClick: function (evt) {        var y = evt.xy.y;        var top = parseInt(this.slider.top);        var levels = Math.floor((y - top)/this.zoomStopHeight);        this.map.zoomTo(this.map.getZoomLevels() - levels);        Event.stop(evt);    },
meta: 8310	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/8310/c8ed8cee87fae7dd1e1f91a074edbfeb82b18e4e/PanZoomBar.js/buggy/lib/OpenLayers/Control/PanZoomBar.js