<input type="radio" name="vibor2" value="70" <?=($row['prr']==70)?'checked="checked"':' '?>>name1&nbsp
  <input type="radio" name="vibor2" value="100"<?=($row['prr']==100)?'checked="checked"':' '?>>name2&nbsp
  <input type="radio" name="vibor2" value="120"<?=($row['prr']==120)?'checked="checked"':' '?>>name3&nbsp
  <input type="radio" name="vibor2" value="150"<?=($row['prr']==150)?'checked="checked"':' '?>>name4&nbsp
  <input type="hidden" name="vibor2" value="150"<?=($row['prr']==150)?'checked="checked"':' '?>><br>
  <script>
   var inputs = document.getElementsByName('vibor2');
   for (var i=0; i<inputs.length-1; i++)  {
       inputs[i].onchange = function ()
{
   inputs[inputs.length-1].value = this.value
}
   }
</script>
<input type="int" name="vibor2" value="<?=$row['prr']?>">