#16 Description in image map balloons

[Anonymous]

It would be nice to possibility of displaying
descriptions in image maps balloons and
also both Y-axis/X-axis (configurable) on certain point.

Additionally descriptions parameter should also support
arrays e.g.:
$DataSet->AddPoint(
array(10,15,7,4),
"Serie1",
array('value 10','value 15','value 7','value 4')
);