function tabs_z(o,o2,n,nm,cm){
var m_n = document.getElementById(o).getElementsByTagName(nm);
var c_n = document.getElementById(o2).getElementsByTagName(cm);
for(i=0;i<m_n.length;i++){
m_n[i].className=i==n?"on":"off";
c_n[i].className=i==n?"dis":"undis";
}
}