function calcul_art11(){
		var tr_a11 = Number(document.getElementById("trdeprix_a11").value);
			if (tr_a11==1) {
				var p1_a11 = Number(document.getElementById("p1_a11").value);
				var q_a11 = Number(document.getElementById("q_a11").value);
					if (q_a11>=1) {
						var p_a11 = Number(p1_a11);
						var total_a11 = Number(p_a11 * q_a11);
						document.getElementById("total_a11").value = total_a11.toFixed(2);
						var ttc_a11 = Number(total_a11 * 1.196);
						document.getElementById("ttc_a11").value = ttc_a11.toFixed(2);
						}
				}
			else if (tr_a11==2) {
				var s1_a11 = Number(document.getElementById("seuilp1_a11").value);
                var p1_a11 = Number(document.getElementById("p1_a11").value);
				var p2_a11 = Number(document.getElementById("p2_a11").value);
                var q_a11 = Number(document.getElementById("q_a11").value);
					if (q_a11>=0 && q_a11<s1_a11) {
						var p_a11 = Number(p1_a11);
						var total_a11 = Number(p_a11 * q_a11);
						document.getElementById("total_a11").value = total_a11.toFixed(2);
						var ttc_a11 = Number(total_a11 * 1.196);
						document.getElementById("ttc_a11").value = ttc_a11.toFixed(2);
						}
					else {
						var p_a11 = Number(p2_a11);
						var total_a11 = Number(p_a11 * q_a11);
						document.getElementById("total_a11").value = total_a11.toFixed(2);
						var ttc_a11 = Number(total_a11 * 1.196);
						document.getElementById("ttc_a11").value = ttc_a11.toFixed(2);
						}
				}
			else if (tr_a11==3) {
				var s1_a11 = Number(document.getElementById("seuilp1_a11").value);
				var s2_a11 = Number(document.getElementById("seuilp2_a11").value);
                var p1_a11 = Number(document.getElementById("p1_a11").value);
				var p2_a11 = Number(document.getElementById("p2_a11").value);
				var p3_a11 = Number(document.getElementById("p3_a11").value);
                var q_a11 = Number(document.getElementById("q_a11").value);
					if (q_a11>=0 && q_a11<s1_a11) {
						var p_a11 = Number(p1_a11);
						var total_a11 = Number(p_a11 * q_a11);
						document.getElementById("total_a11").value = total_a11.toFixed(2);
						var ttc_a11 = Number(total_a11 * 1.196);
						document.getElementById("ttc_a11").value = ttc_a11.toFixed(2);
						}
					else if (q_a11>=s1_a11 && q_a11<s2_a11) {
						var p_a11 = Number(p2_a11);
						var total_a11 = Number(p_a11 * q_a11);
						document.getElementById("total_a11").value = total_a11.toFixed(2);
						var ttc_a11 = Number(total_a11 * 1.196);
						document.getElementById("ttc_a11").value = ttc_a11.toFixed(2);
						}
					else {
						var p_a11 = Number(p3_a11);
						var total_a11 = Number(p_a11 * q_a11);
						document.getElementById("total_a11").value = total_a11.toFixed(2);
						var ttc_a11 = Number(total_a11 * 1.196);
						document.getElementById("ttc_a11").value = ttc_a11.toFixed(2);
						}
				}
    }