var cq = 1;           
  var fq = 41;           
  var sd = 1;           
  var ep = 0;           
           
function nq(val) {           
 
  var allok = true;
   var inp_type = document.getElementById("vopr" + val + "t").value;
  if (inp_type == "t") {
   allok = document.getElementById("vopr" + val).value.length > 0;
   } else if (inp_type == "r") {
   var group = document.getElementsByName("vopr" + val);
   var radiook = false;
      for (var i=0; i<group.length; i++) {
          if (group[i].checked) {
           radiook = true; 
    }
          }
   allok = radiook;
  }
  
 if (allok==false) {
  alert('Вы не ответили');
   return false;
 }
 
   cq = val + 1;           
   if (cq > fq) { cq = fq; }  
   hideit(cq - 1);
   showit(cq);       
   if (cq == fq) {           
       var itm = document.getElementById('control-buttons');           
       itm.style.display="none";           
   }           
 
}
           
function showit(cq) {           
   var itm = document.getElementById("ss-" + cq);           
   itm.style.display="block";           
}           
           
function hideit(cq) {           
   var itm = document.getElementById("ss-" + cq);           
   itm.style.display="none";           
}