function calcul_art7(){
		var tr_a7 = Number(document.getElementById("trdeprix_a7").value);
			if (tr_a7==1) {
				var p1_a7 = Number(document.getElementById("p1_a7").value);
				var q_a7 = Number(document.getElementById("q_a7").value);
					if (q_a7>=1) {
						var p_a7 = Number(p1_a7);
						var total_a7 = Number(p_a7 * q_a7);
						document.getElementById("total_a7").value = total_a7.toFixed(2);
						var ttc_a7 = Number(total_a7 * 1.196);
						document.getElementById("ttc_a7").value = ttc_a7.toFixed(2);
						}
				}
			else if (tr_a7==2) {
				var s1_a7 = Number(document.getElementById("seuilp1_a7").value);
                var p1_a7 = Number(document.getElementById("p1_a7").value);
				var p2_a7 = Number(document.getElementById("p2_a7").value);
                var q_a7 = Number(document.getElementById("q_a7").value);
					if (q_a7>=0 && q_a7<s1_a7) {
						var p_a7 = Number(p1_a7);
						var total_a7 = Number(p_a7 * q_a7);
						document.getElementById("total_a7").value = total_a7.toFixed(2);
						var ttc_a7 = Number(total_a7 * 1.196);
						document.getElementById("ttc_a7").value = ttc_a7.toFixed(2);
						}
					else {
						var p_a7 = Number(p2_a7);
						var total_a7 = Number(p_a7* q_a7);
						document.getElementById("total_a7").value = total_a7.toFixed(2);
						var ttc_a7 = Number(total_a7 * 1.196);
						document.getElementById("ttc_a7").value = ttc_a7.toFixed(2);
						}
				}
			else if (tr_a7==3) {
				var s1_a7 = Number(document.getElementById("seuilp1_a7").value);
				var s2_a7 = Number(document.getElementById("seuilp2_a7").value);
                var p1_a7 = Number(document.getElementById("p1_a7").value);
				var p2_a7 = Number(document.getElementById("p2_a7").value);
				var p3_a7 = Number(document.getElementById("p3_a7").value);
                var q_a7 = Number(document.getElementById("q_a7").value);
					if (q_a7>=0 && q_a7<s1_a7) {
						var p_a7 = Number(p1_a7);
						var total_a7 = Number(p_a7 * q_a7);
						document.getElementById("total_a7").value = total_a7.toFixed(2);
						var ttc_a7 = Number(total_a7 * 1.196);
						document.getElementById("ttc_a7").value = ttc_a7.toFixed(2);
						}
					else if (q_a7>=s1_a7 && q_a7<s2_a7) {
						var p_a7 = Number(p2_a7);
						var total_a7 = Number(p_a7 * q_a7);
						document.getElementById("total_a7").value = total_a7.toFixed(2);
						var ttc_a7 = Number(total_a7 * 1.196);
						document.getElementById("ttc_a7").value = ttc_a7.toFixed(2);
						}
					else {
						var p_a7 = Number(p3_a7);
						var total_a7 = Number(p_a7 * q_a7);
						document.getElementById("total_a7").value = total_a7.toFixed(2);
						var ttc_a7 = Number(total_a7 * 1.196);
						document.getElementById("ttc_a7").value = ttc_a7.toFixed(2);
						}
				}
    }