var i_promo=1;

function promo_show(id){

for (i=1; i<5; i++){
  document.getElementById('promo'+i).style.display = 'none';
}
document.getElementById('promo'+id).style.display = 'block';

}

function new_show(id){

for (i=1; i<5; i++){
  document.getElementById('new'+i).style.display = 'none';
}
document.getElementById('new'+id).style.display = 'block';

}