add: if (!Event.isLeftClick(evt)) return; 
context:     zoomBarUp:function(evt) {        if (this.zoomStart) {            this.div.style.cursor="default";            this.map.events.remove("mousemove");            this.map.events.remove("mouseup");            var deltaY = this.zoomStart.y - evt.xy.y            this.map.zoomTo(this.map.zoom + Math.round(deltaY/this.zoomStopHeight));            this.moveZoomBar();            this.mouseDragStart = null;            Event.stop(evt);        }    },
meta: 1027	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/1027/c92cd6d88a59f79879c73965c26269e13afa25e3/PanZoomBar.js/clean/lib/OpenLayers/Control/PanZoomBar.js