[TYPO3-english] Change Text "login" to "logout " on TMENU

[Ipan]

Hi,

 i have login site on my navigation and i want to change it to logout, if the user logged in. 
As simple as it should, i can't figure it out. 

Here ist my Typoscript for my Navigation:

  page.10.marks.MN = HMENU
  page.10.marks.MN {
     special = directory
     special.value = {$idMain}
     entryLevel = 2
     1 = TMENU
     1.NO = 1
     1.wrap = <ul>|</ul>
     1.NO.wrapItemAndSub = <li><span>|</span></li>
     1.ACT < .1.NO
     1.ACT.ATagParams = class='aktiv'
     2 < .1
     3 < .1
  } 

How can i make it possible?

Thanks,

Ivan