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: 4411	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/4411/2b5f13ae0eea826ef41a516d5c3941754bc629f9/PanZoomBar.js/clean/lib/OpenLayers/Control/PanZoomBar.js