function stripeTables() {
    if (!document.getElementsByTagName) return false;
    var tables = document.getElementsByTagName("table");
    for (var i=0; i<tables.length; i++) {
        var odd = false;
        var rows = tables[i].getElementsByTagName("tr");
        for (var j=0; j<rows.length; j++) {
            if (odd == true) {
                addClass(rows[j],"odd");
                odd =  false;
            } else {
                odd = true;
            }
        }
    }
}

addLoadEvent(stripeTables);