If you have specified markers for the polar plot (by setting the mark property of the plot) each marker can be a hot spot in a client side image map. The target URL are as usual specified with the SetCSIMTargets() as the following short code excerpt shows
// Start by specifying the proper URL targets
$targets
= array("#1","#2", ....... );
$polarplot
= new PoalrPlot
($data);
$polarplot
->mark->SetType(
MARK_SQUARE);
$polarplot
->SetCSIMTargets
(targets);
$graph->Add(
$polarplot);
$graph->StrokeCSIM();