ID:1671930
 
(See the best response by Kaiochao.)
Code:
mob
var
image/wy2
turf
ground
MouseDown()
usr.wy2=image('highlight_l.dmi',locate(x,y,z),icon_state="premove")
usr.wy2.pixel_x=-64
usr.wy2.pixel_y=-32
usr.wy2.mouse_opacity=0


Problem description:

Tried that, didn't seem to have any effect. How do I make an image invisible to my mouse?
Best response
Create an object on the turf with mouse_opacity=0, attach image to object.

Also, locate(x, y, z) for a turf is always equal to src, the turf itself.