if (settings.panLeft) {
            settings.panLeft.bind('mousedown.panZoom', eventData, function(event) {
                event.preventDefault(); event.data.target.panZoom('mouseDown', 'panLeft');
            }).bind('mouseleave.panZoom mouseup.panZoom', eventData, function(event) {
                event.preventDefault(); event.data.target.panZoom('mouseUp');