function tabit(id,cid,id_v) { 
if(id_v==1)
{
document.getElementById('tab0') .className="menu4"; 
document.getElementById('tab1') .className="menu4"; 
 document.getElementById('tab2') .className="menu4";
  document.getElementById('ctab0') .style.display="none";
 document.getElementById('ctab1') .style.display="none"; 
 document.getElementById('ctab2') .style.display="none";
document.getElementById(id).className="menu3"; 
document.getElementById(cid).style.display="block"; }
else
if(id_v==2)
{
 document.getElementById('tab3') .className="menu4"; 
 document.getElementById('tab4') .className="menu4"; 
 document.getElementById('ctab3') .style.display="none"; 
 document.getElementById('ctab4') .style.display="none";
document.getElementById(id).className="menu3"; 
document.getElementById(cid).style.display="block";
}
else
if(id_v==3)
{
 document.getElementById('tab5') .className="menu4"; 
 document.getElementById('tab6') .className="menu4"; 
 document.getElementById('ctab5') .style.display="none"; 
 document.getElementById('ctab6') .style.display="none";
document.getElementById(id).className="menu3"; 
document.getElementById(cid).style.display="block";
}

}