Logout link unavailable in Firefox

Hi all,
i’ve small problem with logging out from freePBX. I 've created various FreePBX administrators accounts,and there is no problem with loggin in to freePBX. Problem is, that when i’m using Firefox (Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.12) Gecko/20080229 Firefox/2.0.0.12), the “(Logout)” link is unavailable, i.e. i can’t click on the (Logout) string. Using Opera browser Logout link is correctly displayed and functional.
Could you please help me?
Thanks in advance,
Stanley

Apparently, there is a layer over the Logout link.
A posible solution is to use z-index.

In common/mainstyle.css add z-index to #login_message:

#login_message {
z-index:1;
position:absolute;
top:55px;
right:5px;
width: 180px;
font-size:12px;
background-color: transparent;
}