Dual Monitor Problem

I just dug up an old 15in CRT monitor to add to my 17in lcd. I need the CRT on the left but I want the right screen as the primary one. I've got it all working but to get the mouse on the left screen I have to move right and I cant find the setting to change this. Sorry if I'm not making sense. Can anyone help me?

Thanks.

just go to display settings and drag the second screen to the position you want it

Thanks man :D.