var lides = new Array();
		lides[0] = 0;
		lides[1] = 0;
		lides[2] = 0;
		lides[3] = 0;
		lides[4] = 0;
		lides[5] = 0;
		lides[6] = 0;
		lides[7] = 0;
		function showlayers(type, i) {
			switch (type) {
					case 0:
					layername = 'bdiv';
					break;
					case 1:
					layername = 'cdiv';
					break;
					case 2:
					layername = 'sdiv';
					break;
					case 3:
					layername = 'pdiv';
					break;
					case 4:
					layername = 'ndiv';
					break;
					case 5:
					layername = 'adiv';
					break;
					case 6:
					layername = 'cdiv';
					break;
					case 7:
					layername = 'ddiv';
					break;
			}//switch
			if (document.all(layername+lides[type])) document.all(layername+lides[type]).style.display = 'none';
			if (document.all(layername+i)) 	document.all(layername+i).style.display = '';
			lides[type] = i;
		}