function calcul_art6(){
		var tr_a6 = Number(document.getElementById("trdeprix_a6").value);
			if (tr_a6==1) {
				var p1_a6 = Number(document.getElementById("p1_a6").value);
				var q_a6 = Number(document.getElementById("q_a6").value);
					if (q_a6>=1) {
						var p_a6 = Number(p1_a6);
						var total_a6 = Number(p_a6 * q_a6);
						document.getElementById("total_a6").value = total_a6.toFixed(2);
						var ttc_a6 = Number(total_a6 * 1.196);
						document.getElementById("ttc_a6").value = ttc_a6.toFixed(2);
						}
				}
			else if (tr_a6==2) {
				var s1_a6 = Number(document.getElementById("seuilp1_a6").value);
                var p1_a6 = Number(document.getElementById("p1_a6").value);
				var p2_a6 = Number(document.getElementById("p2_a6").value);
                var q_a6 = Number(document.getElementById("q_a6").value);
					if (q_a6>=0 && q_a6<s1_a6) {
						var p_a6 = Number(p1_a6);
						var total_a6 = Number(p_a6 * q_a6);
						document.getElementById("total_a6").value = total_a6.toFixed(2);
						var ttc_a6 = Number(total_a6 * 1.196);
						document.getElementById("ttc_a6").value = ttc_a6.toFixed(2);
						}
					else {
						var p_a6 = Number(p2_a6);
						var total_a6 = Number(p_a6* q_a6);
						document.getElementById("total_a6").value = total_a6.toFixed(2);
						var ttc_a6 = Number(total_a6 * 1.196);
						document.getElementById("ttc_a6").value = ttc_a6.toFixed(2);
						}
				}
			else if (tr_a6==3) {
				var s1_a6 = Number(document.getElementById("seuilp1_a6").value);
				var s2_a6 = Number(document.getElementById("seuilp2_a6").value);
                var p1_a6 = Number(document.getElementById("p1_a6").value);
				var p2_a6 = Number(document.getElementById("p2_a6").value);
				var p3_a6 = Number(document.getElementById("p3_a6").value);
                var q_a6 = Number(document.getElementById("q_a6").value);
					if (q_a6>=0 && q_a6<s1_a6) {
						var p_a6 = Number(p1_a6);
						var total_a6 = Number(p_a6 * q_a6);
						document.getElementById("total_a6").value = total_a6.toFixed(2);
						var ttc_a6 = Number(total_a6 * 1.196);
						document.getElementById("ttc_a6").value = ttc_a6.toFixed(2);
						}
					else if (q_a6>=s1_a6 && q_a6<s2_a6) {
						var p_a6 = Number(p2_a6);
						var total_a6 = Number(p_a6 * q_a6);
						document.getElementById("total_a6").value = total_a6.toFixed(2);
						var ttc_a6 = Number(total_a6 * 1.196);
						document.getElementById("ttc_a6").value = ttc_a6.toFixed(2);
						}
					else {
						var p_a6 = Number(p3_a6);
						var total_a6 = Number(p_a6 * q_a6);
						document.getElementById("total_a6").value = total_a6.toFixed(2);
						var ttc_a6 = Number(total_a6 * 1.196);
						document.getElementById("ttc_a6").value = ttc_a6.toFixed(2);
						}
				}
    }