Again Problem in tut 4

I have used the sript of tut 5 (AIM DOWN) but when i click right mouse nothing happens . But the second time when i click the camera goes to the right position . everytime this problem happens . so i have to click once first then the script is successful .. so anyone can help me ? ?? ?

Either it is a problem with the input part of the script or a problem with your computer. Do you ever have to click things twice to get them to register on your pc?