function showmenu (ide) {
		if (ide == 'menucss'){
		document.getElementById(ide).style.display = "block";
		document.getElementById('menucss4').style.display = "none";
		document.getElementById('presentation').style.background = "#b61d1c";
		document.getElementById('acquereur').style.background = "#000";
		document.getElementById('faqd').style.background = "#000";
		document.getElementById('vendeur').style.background = "#000";
		document.getElementById('menucss2').style.display = "none";
		document.getElementById('menucss3').style.display = "none";
		}
		if (ide == 'menucss2'){
		document.getElementById(ide).style.display = "block";
		document.getElementById('menucss4').style.display = "none";
		document.getElementById('faqd').style.background = "#000";
		document.getElementById('presentation').style.background = "#000";
		document.getElementById('acquereur').style.background = "#b61d1c";
		document.getElementById('vendeur').style.background = "#000";
		document.getElementById('menucss').style.display = "none";
		document.getElementById('menucss3').style.display = "none";
		}
		if (ide == 'menucss3'){
		document.getElementById(ide).style.display = "block";
		document.getElementById('menucss4').style.display = "none";
		document.getElementById('faqd').style.background = "#000";
		document.getElementById('presentation').style.background = "#000";
		document.getElementById('acquereur').style.background = "#000";
		document.getElementById('vendeur').style.background = "#b61d1c";
		document.getElementById('menucss2').style.display = "none";
		document.getElementById('menucss').style.display = "none";
		}
		if (ide == 'menucss4'){
		document.getElementById(ide).style.display = "block";
		document.getElementById('presentation').style.background = "#000";
		document.getElementById('acquereur').style.background = "#000";
		document.getElementById('vendeur').style.background = "#000";
		document.getElementById('menucss2').style.display = "none";
		document.getElementById('faqd').style.background = "#b61d1c";
		document.getElementById('menucss').style.display = "none";
		document.getElementById('menucss3').style.display = "none";
		}
		if (ide == 'no'){
		document.getElementById('menucss3').style.display = "none";
		document.getElementById('presentation').style.background = "#000";
		document.getElementById('acquereur').style.background = "#000";
		document.getElementById('vendeur').style.background = "#000";
		document.getElementById('faqd').style.background = "#000";
		document.getElementById('menucss2').style.display = "none";
		document.getElementById('menucss').style.display = "none";
		document.getElementById('menucss4').style.display = "none";
		}
	}