dodic, I see several ways to do what your wanting,
if you dont plan on moving the camera just insert code to take a snap shot , and get the x,y co-ordinates from the bitmap you saved, if however, you are planing on either the camera or the objects moving you'll need to use the object screen x() and object screen y() commands in conjunction with the mousex() and mouse y() commands like so
if mouseclick()=1 and mousex()> object screen x(1)-50 and mousex()< object screen x(1)+50 and mousey()>object screen y(1)-50 and mousey()<object screen y(1)+50
`code
endif
also, rather than making it a top perspecitive and adjusting the camera view, simply adjust the objects y co-coordinates. I promise it will be a lot easier that way , anyhow, hope this helps ya
also, forgot to add that you can place that code in a loop to check for every object you have in the game ... just replace the 1's with a variable and do a for-next loop.
Bluestar4~