Select item in listBox1 and corresponding item in ListBox2 is also selected

[ken1000]

Hi,
Hi I have two Listboxes list1 has lets say Firstname in List1 and List2 has surnames.
How do I select an item in List1 and have it's corresponding item in List2 selected as well?

So if I select Item 6 in List1, I want item6 in List2 to be selected too.

Ken