add: if (!Event.isLeftClick(evt)) return; 
context:     divClick: function (evt) {        var y = evt.xy.y;        var top = Position.page(evt.object)[1];        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/c92cd6d88a59f79879c73965c26269e13afa25e3/PanZoomBar.js/clean/lib/OpenLayers/Control/PanZoomBar.js