选项卡:
ul #nav>li*3>a+ul>li*3
fuction(idName,mode){
document.getdocumentById(idName).style.display=mode;
}

在这张图里,为了让ie6兼容 ,在li里面用到了display:inline
fuction(idName,mode){
document.getdocumentById(idName).style.display=mode;
}