function calcul_art9(){
		var tr_a9 = Number(document.getElementById("trdeprix_a9").value);
			if (tr_a9==1) {
				var p1_a9 = Number(document.getElementById("p1_a9").value);
				var q_a9 = Number(document.getElementById("q_a9").value);
					if (q_a9>=1) {
						var p_a9 = Number(p1_a9);
						var total_a9 = Number(p_a9 * q_a9);
						document.getElementById("total_a9").value = total_a9.toFixed(2);
						var ttc_a9 = Number(total_a9 * 1.196);
						document.getElementById("ttc_a9").value = ttc_a9.toFixed(2);
						}
				}getElementById("ttc_a9").value = ttc_a9.toFixed(2);
				}
			else if (tr_a9==2) {
				var s1_a9 = Number(document.getElementById("seuilp1_a9").value);
                var p1_a9 = Number(document.getElementById("p1_a9").value);
				var p2_a9 = Number(document.getElementById("p2_a9").value);
                var q_a9 = Number(document.getElementById("q_a9").value);
					if (q_a9>=0 && q_a9<s1_a9) {
						var p_a9 = Number(p1_a9);
						var total_a9 = Number(p_a9 * q_a9);
						document.getElementById("total_a9").value = total_a9.toFixed(2);
						var ttc_a9 = Number(total_a9 * 1.196);
						document.getElementById("ttc_a9").value = ttc_a9.toFixed(2);
						}
					else {
						var p_a9 = Number(p2_a9);
						var total_a9 = Number(p_a9 * q_a9);
						document.getElementById("total_a9").value = total_a9.toFixed(2);
						var ttc_a9 = Number(total_a9 * 1.196);
						document.getElementById("ttc_a9").value = ttc_a9.toFixed(2);
						}
				}
			else if (tr_a9==3) {
				var s1_a9 = Number(document.getElementById("seuilp1_a9").value);
				var s2_a9 = Number(document.getElementById("seuilp2_a9").value);
                var p1_a9 = Number(document.getElementById("p1_a9").value);
				var p2_a9 = Number(document.getElementById("p2_a9").value);
				var p3_a9 = Number(document.getElementById("p3_a9").value);
                var q_a9 = Number(document.getElementById("q_a9").value);
					if (q_a9>=0 && q_a9<s1_a9) {
						var p_a9 = Number(p1_a9);
						var total_a9 = Number(p_a9 * q_a9);
						document.getElementById("total_a9").value = total_a9.toFixed(2);
						var ttc_a9 = Number(total_a9 * 1.196);
						document.getElementById("ttc_a9").value = ttc_a9.toFixed(2);
						}
					else if (q_a9>=s1_a9 && q_a9<s2_a9) {
						var p_a9 = Number(p2_a9);
						var total_a9 = Number(p_a9 * q_a9);
						document.getElementById("total_a9").value = total_a9.toFixed(2);
						var ttc_a9 = Number(total_a9 * 1.196);
						document.getElementById("ttc_a9").value = ttc_a9.toFixed(2);
						}
					else {
						var p_a9 = Number(p3_a9);
						var total_a9 = Number(p_a9 * q_a9);
						document.getElementById("total_a9").value = total_a9.toFixed(2);
						var ttc_a9 = Number(total_a9 * 1.196);
						document.getElementById("ttc_a9").value = ttc_a9.toFixed(2);
						}
				}
    }