Changing color of a marker in a series

[Mark Hansen]

I'm trying to draw a simple line graph that highlights some of the
points (markers) with a different color. The markers are all blue,
but I want to change some to red, depending on the y-axis value.

Marker options seem to be applied to the entire series. Is there any
way I can apply a different color to a few individual markers in a
series.

I was thinking maybe using postDrawSeriesHooks, but I cannot find any
example to work from and I'm not experienced enough at JS to figure it
out from looking at the jqplot source code.

Any help would be appreciated.

Thanks!