locking?

i have recently aquired a toyota carina e gli auto , the drivers door handle wont open the door, i have to open the passenger door and reach over and open the drivers door , i inspected it today and found out that the lock on the drivers inside handle wont fully engage until the inside handle is pulled open ,then the lock is open , and the door can be opened from the outside , but trouble is when i come to lock the car , the outside handle wont work again , either i have to leave the car open (dont think so ) or climb over the pasenger seat every time i wish to use the car , can anybody surgest anything that might help thanks