function affiche_sondage()
{

document.getElementById('1').style.display='none'; 
document.getElementById('2').style.display='block'; 
document.getElementById('3').style.display='block';


}

function supprime_sondage()
{
document.getElementById('1').style.display='block'; 
document.getElementById('2').style.display='none'; 
document.getElementById('3').style.display='none';
document.getElementById('post').question.value='';
document.getElementById('post').reponse_1.value='';
document.getElementById('post').reponse_2.value='';
document.getElementById('post').reponse_3.value='';
document.getElementById('post').reponse_4.value='';
document.getElementById('post').reponse_5.value='';
document.getElementById('post').reponse_6.value='';
document.getElementById('post').reponse_7.value='';
document.getElementById('post').reponse_8.value='';
document.getElementById('post').reponse_9.value='';
document.getElementById('post').reponse_10.value='';


}