var opened_answer = null;

function checkQuestion() {
  
  if(document.getElementById('question_field').value!='') { 
    
    document.getElementById('askanexpertform').submit(); 
    
  } else { 
    
    alert('Compila il campo della domanda'); 
    
  }
  
}

function openQuestion(id) {

  //alert("opened_answer :"+opened_answer+"\nid:"+id);

  if(opened_answer != null) {
  
    document.getElementById(opened_answer).style.display = 'none';
    
  }
  
  if(id != opened_answer) {
  
    document.getElementById(id).style.display = 'block';

    opened_answer = id; 

  } else {
  
    opened_answer = null;
  
  }

}