Auto Changing Crosshair/scripting, help please
 

for those of u who have played spearhead u will have noticed that when u put the crosshair over a teammate it changes. does anyone know where the scripts for this are etc. I have big plans for this in mohaa if I can find the damn scripts. I know where the actual tga file is (crosshair_friend.tga) just cant find where the script that makes it change is.
please help.
eatthis: