The jMenu plugin can be customized by css file

jMenu

 

 

If you want to use the jMenu plugin within  show_menu_2 the code must look something like this

 

show_menu2(
        $aMenu          = 1,
        $aStart         = SM2_ROOT,
        $aMaxLevel      = SM2_ALL,
        $aOptions       = SM2_ALL|SM2_PRETTY,
        $aItemOpen      = '[li] <a href="[url]" target="[target]" class=[if(level==parent){"fNiv"}else{[page-id]}]>[menu_title]</a>',
        $aItemClose     = '</li>',
        $aMenuOpen      = '<ul id=[if(level==parent){"jMenu"}else{"my-id"}]>',
        $aMenuClose     = '</ul>',
        $aTopItemOpen   = false,
        $aTopMenuOpen   = false
        );