function horizontal() {

    var navItems = document.getElementById("barra").getElementsByTagName("li");

    for (var i = 0; i < navItems.length; i++) {
        if ((navItems[i].className == "menuvertical") || (navItems[i].className == "submenu")) {
            if (navItems[i].getElementsByTagName('ul')[0] != null) {
                navItems[i].onmouseover = function() { this.getElementsByTagName('ul')[0].style.display = "block"; this.style.backgroundColor = "#f9f9f9"; }
                navItems[i].onmouseout = function() { this.getElementsByTagName('ul')[0].style.display = "none"; this.style.backgroundColor = "#FFFFFF"; }
            }
        }
    }

} 

function zebra(id, classe)
{
    var tabela = document.getElementById(id);
    var linhas = tabela.getElementsByTagName("tr");
    for (var i = 0; i < linhas.length; i++) {
    ((i%2) != 0) ? linhas[i].className = classe : void(0);
    }
}