var yAxisLabelWidth = e.dygraph.getOptionForAxis('axisLabelWidth', 'y');
// determine floating [left, top] coordinates of the legend div
// within the plotter_ area
var yAxisLabelWidth = e.dygraph.getOptionForAxis('axisLabelWidth', 'y');
// determine floating [left, top] coordinates of the legend div
// within the plotter_ area