function navLink(cat_d0,cat_d1) {
	if (cat_d0 == "1") {
		switch (cat_d1) {
			case 1:
			location.href="index_au_foreword.html";
			break;
			case 2:
			location.href="index_au_introduction.html";
			break;
			case 3:
			location.href="index_au_history.html";
			break;
			case 4:
			location.href="index_au_map.html";
			break;
		}
	}
	else if (cat_d0 == "2") {
		switch (cat_d1) {
			case 1:
			location.href="index_ms_machinefacilities.html";
			break;
			case 2:
			location.href="index_ms_productitems.html";
			break;
		}
	}
	else if (cat_d0 == "3") {
		switch (cat_d1) {
			case 0:
			location.href="index_ps.html";
			break;
		}
	}
	else if (cat_d0 == "4") {
		switch (cat_d1) {
			case 0:
			location.href="mailto:yholee@shellweb.co.kr";
			break;
		}
	}
	else {
		location.href="index_au.html";
	}
}