var area_info = new Array();

area_info[0]	= new Array("都市全体選択");
area_info[1] 	= new Array("ソウル全体選択","市内中心部","東大門","梨泰院","江南","新村/梨花女大","西部","東部","その他地域");
area_info[2]	= new Array("釜山全体選択","釜山市内","海雲台","釜山空港","その他地域");
area_info[3] 	= new Array("済州全体選択","済州市内","中文団地","西帰浦","東部","西部","その他地域");
area_info[4] 	= new Array("仁川全体選択","仁川市内","仁川空港","その他地域");
area_info[5]	= new Array("慶州全体選択");
area_info[6]	= new Array("大邱全体選択");
area_info[7]	= new Array("大田全体選択");
area_info[8]	= new Array("蔚山全体選択");
area_info[9]	= new Array("京畿道全体選択");
area_info[10]	= new Array("慶商南道全体選択");
area_info[11]	= new Array("慶商北道全体選択");
area_info[12]	= new Array("江原道全体選択");
area_info[13]	= new Array("忠清北道全体選択");
area_info[14]	= new Array("忠清北道全体選択");
area_info[15]	= new Array("全羅南道全体選択");
area_info[16]	= new Array("全羅北道全体選択");
area_info[17]	= new Array("その他地域");


function city_change() {
	var sel = document.frm_hwrite.ad_area;
	var myindex = frm_hwrite.ad_city.selectedIndex;

	if(myindex == 1 || myindex == 2 || myindex == 3 || myindex == 4){
		document.all.areachk.style.display = "block";
	}else{
		document.all.areachk.style.display = "none";
	}
	/* option menu delete */
	for (i=sel.length-1; i>=0; i--){
		sel.options[i] = null
	}
	/* option box */
	for (i=0; i < area_info[myindex].length;i++){
		if(i==0) {
			j="";
		}else {
			j= i;
		}
		sel.options[i] = new Option(area_info[myindex][i],j);
	}
}