function ajoute(bouton){
  bouton.parentNode.getElementsByTagName('input')[0].value = parseInt(bouton.parentNode.getElementsByTagName('input')[0].value) + 1;

  var prix = new Number(bouton.parentNode.parentNode.parentNode.getElementsByTagName('label')[0].innerHTML);
	var prix_total = new Number(bouton.parentNode.parentNode.parentNode.getElementsByTagName('label')[1].innerHTML) + prix;
	bouton.parentNode.parentNode.parentNode.getElementsByTagName('label')[1].innerHTML = prix_total;

	incremente_quantite(1, prix);
}

function enleve(bouton){
  if(bouton.parentNode.getElementsByTagName('input')[0].value > 0){
    bouton.parentNode.getElementsByTagName('input')[0].value -= 1;
    
		var prix = new Number(bouton.parentNode.parentNode.parentNode.getElementsByTagName('label')[0].innerHTML);
		var prix_total = new Number(bouton.parentNode.parentNode.parentNode.getElementsByTagName('label')[1].innerHTML) - prix;
		bouton.parentNode.parentNode.parentNode.getElementsByTagName('label')[1].innerHTML = prix_total;

    incremente_quantite(-1, prix);
  }
}

var div_ouvert = null;

function show_articles(id_div){
  var display = document.getElementById(id_div).style.display;
  
  if(div_ouvert){
    div_ouvert.style.display = 'none';
	}
  
  if(display == 'block'){
    document.getElementById(id_div).style.display = 'none';
    div_ouvert = null;
  }
  else{
    document.getElementById(id_div).style.display = 'block';
    div_ouvert = document.getElementById(id_div);
  }
}

function incremente_quantite(quantite, prix){
	prix = new Number(prix);

	var total_ttc = new Number(document.getElementById('total_ttc').innerHTML);
	var frais_port = new Number(document.getElementById('frais_port').innerHTML);

	var rajoute_au_total = Math.round(quantite * prix * 100) / 100;

	total_ttc += rajoute_au_total;
	if(total_ttc - frais_port >= 9){
		total_ttc -= frais_port;
		frais_port = 0;
	}
	else{
		frais_port = 9;
    total_ttc += frais_port;
	}

	var total_ht = Math.round(total_ttc / 1.196 * 100) / 100;

  document.getElementById('total_ttc').innerHTML = total_ttc;
  document.getElementById('frais_port').innerHTML = frais_port;
  document.getElementById('total_ht').innerHTML = total_ht;
}