[Typo3] Defining the class of a link in TMENU

[luc_boudreau at uqss.uquebec.ca]

How can I define the class of a link in the TMENU object ?

I've tried the following bit it doesn't work :

# Menu principal
###################################################

temp.menu_principal = HMENU
temp.menu_principal.protectLvar = 1
temp.menu_principal.begin = 1

  # Menu de niveau 1
  ##############
  temp.menu_principal.1 = TMENU
  temp.menu_principal.1 {
    NO.allWrap = <li>|</li>
    NO.stdWrap.htmlSpecialChars = 1
    ATagParams = class="nav"             <-------------
  }

Thanks