function deviceChange() {
					try {
						document.getElementById("levelBox2").disabled = '';
						document.getElementById("levelBox3").disabled = 'disabled';
						document.getElementById("levelBox5").disabled = 'disabled';
						document.getElementById("levelBox4").disabled = 'disabled';
					
						document.getElementById("levelBox3").options.length = 1;
						document.getElementById("levelBox5").options.length = 1;
						document.getElementById("levelBox4").options.length = 1;
					} catch (e) { }
				}
				function brandChange() {
					document.getElementById("levelBox3").disabled = '';
					document.getElementById("levelBox5").disabled = 'disabled';
					document.getElementById("levelBox4").disabled = 'disabled';

					document.getElementById("levelBox5").options.length = 1;
					document.getElementById("levelBox4").options.length = 1;
				}
				function serieChange() {
					document.getElementById("levelBox5").disabled = '';
					document.getElementById("levelBox4").disabled = '';
				}
				// JavaScript Document