function calcul_art2(){
		var tr_a2 = Number(document.getElementById("trdeprix_a2").value);
			if (tr_a2==1) {
				var p1_a2 = Number(document.getElementById("p1_a2").value);
				var q_a2 = Number(document.getElementById("q_a2").value);
					if (q_a2>=1) {
						var p_a2 = Number(p1_a2);
						var total_a2 = Number(p_a2 * q_a2);
						document.getElementById("total_a2").value = total_a2.toFixed(2);
						var ttc_a2 = Number(total_a2 * 1.196);
						document.getElementById("ttc_a2").value = ttc_a2.toFixed(2);
						}
				}
			else if (tr_a2==2) {
				var s1_a2 = Number(document.getElementById("seuilp1_a2").value);
                var p1_a2 = Number(document.getElementById("p1_a2").value);
				var p2_a2 = Number(document.getElementById("p2_a2").value);
                var q_a2 = Number(document.getElementById("q_a2").value);
					if (q_a2>=0 && q_a2<s1_a2) {
						var p_a2 = Number(p1_a2);
						var total_a2 = Number(p_a2 * q_a2);
						document.getElementById("total_a2").value = total_a2.toFixed(2);
						var ttc_a2 = Number(total_a2 * 1.196);
						document.getElementById("ttc_a2").value = ttc_a2.toFixed(2);
						}
					else {
						var p_a2 = Number(p2_a2);
						var total_a2 = Number(p_a2* q_a2);
						document.getElementById("total_a2").value = total_a2.toFixed(2);
						var ttc_a2 = Number(total_a2 * 1.196);
						document.getElementById("ttc_a2").value = ttc_a2.toFixed(2);
						}
				}
			else if (tr_a2==3) {
				var s1_a2 = Number(document.getElementById("seuilp1_a2").value);
				var s2_a2 = Number(document.getElementById("seuilp2_a2").value);
                var p1_a2 = Number(document.getElementById("p1_a2").value);
				var p2_a2 = Number(document.getElementById("p2_a2").value);
				var p3_a2 = Number(document.getElementById("p3_a2").value);
                var q_a2 = Number(document.getElementById("q_a2").value);
					if (q_a2>=0 && q_a2<s1_a2) {
						var p_a2 = Number(p1_a2);
						var total_a2 = Number(p_a2 * q_a2);
						document.getElementById("total_a2").value = total_a2.toFixed(2);
						var ttc_a2 = Number(total_a2 * 1.196);
						document.getElementById("ttc_a2").value = ttc_a2.toFixed(2);
						}
					else if (q_a2>=s1_a2 && q_a2<s2_a2) {
						var p_a2 = Number(p2_a2);
						var total_a2 = Number(p_a2 * q_a2);
						document.getElementById("total_a2").value = total_a2.toFixed(2);
						var ttc_a2 = Number(total_a2 * 1.196);
						document.getElementById("ttc_a2").value = ttc_a2.toFixed(2);
						}
					else {
						var p_a2 = Number(p3_a2);
						var total_a2 = Number(p_a2 * q_a2);
						document.getElementById("total_a2").value = total_a2.toFixed(2);
						var ttc_a2 = Number(total_a2 * 1.196);
						document.getElementById("ttc_a2").value = ttc_a2.toFixed(2);
						}
				}
    }