The Code for you:


function sniper()
{
while(1)
{
if(mouse_right) // right mouse button pressed
{
camera.arc = max(camera.arc - time_step, 30); // reduce fiel of view
}
else
{
camera.arc = min(camera.arc + time_step, 90); // increase fiel of view
}
wait(1);
}

98 is your birth date, right?