[mapserver-users] Highlighting a feature

[padma priya]

Hi
Can anyone give me pointers as to how to highlight a specific feature on a WMS layer. I have a layer which displays few landmarks generated by a mapfile. When a user right clicks on the landmark it has to get highlighted. Or is there a way of my changing the icon of that landmark alone. Currently all the landmarks on that layer are represented by a common icon specified in the mapfile. 
Thanks!
priya