Z-index issue with 3 columns

1

Hi,
I have 3 divs as columns. Using js the items expand /collapse.
In FF, all IE the middle items when expanded are behind the right column. They need to be above. I can not figure out why it is happening only to that one section. To see what I am talking about

site

only the top 3 are styled correctly(Alabama, Louisiana, Ohio).

ANy ideas on why this is happening?

Thanks