How to change focus among multiple select boxes?

Hello,

I have three select boxes in three divs. All of the select boxes are focused when I click them one after the other. I want only one select box to be focused at a time not all.

I tried to do this with an example below. But as you will see, select boxes aren't focused at one click in my example. I have to click twice. Maybe, my if controls are not right enough.

Will you please write me a small example for this? I hope I could explain what I am trying to do. I'm looking forward to your reply. Thank you in advance.

Sincerely Yours,