function select_pref(n,obj){
	var v = obj.options[obj.selectedIndex].value;
	//alert(v);
	if(v.length == 0){
		return ;
	}
	var list = new Array ;
	var url = "/admin/_post_line.php" ;
	new Ajax.Request(url, {
		method: "get",
		parameters: 'code='+v,
		onSuccess:function(httpObj){
			list = httpObj.responseText.split(';');
		}
	});
	
	if(n == '1'){
		selObj = form.elements['line1_line'];
	}else if(n == '2'){
		selObj = form.elements['line2_line'];
	}else if(n == '3'){
		selObj = form.elements['line3_line'];
	}else if(n == '4'){
		selObj = form.elements['line4_line'];
	}

	//alert(selObj.name);
	
	createSelection( selObj );
	
	for( var i = 0 ; i < list.length ; i++) {
		var e = list[i];
		var c = e.split(',');
		var x = c[0];
		var y = c[1];
		addSelOption ( selObj , x, y);
	}

}
function select_line(n,obj){
	var v = obj.options[obj.selectedIndex].value;
	//alert(obj.form.name);
	//alert(v);
	if(v.length == 0){
		return ;
	}
	var list = new Array ;
	var url = "/admin/_post_station.php" ;
	new Ajax.Request(url, {
		method: "get",
		parameters: 'code='+v,
		onSuccess:function(httpObj){
			//alert(httpObj.responseText);
			list = httpObj.responseText.split(';');
		}
	});
	if(n == '1'){
		selObj = form.elements['line1_sta'];
	}else if(n == '2'){
		selObj = form.elements['line2_sta'];
	}else if(n == '3'){
		selObj = form.elements['line3_sta'];
	}else if(n == '4'){
		selObj = form.elements['line4_sta'];
	}

	//alert(selObj.name);
	
	createSelection( selObj );
	
	for( var i = 0 ; i < list.length ; i++) {
		var e = list[i];
		var c = e.split(',');
		var x = c[0];
		var y = c[1];
		addSelOption ( selObj , x, y);
	}
}


function addSelOption( selObj, myValue, myText ){
	selObj.length++;
	selObj.options[ selObj.length - 1].value = myValue ;
	selObj.options[ selObj.length - 1].text  = myText;
}
function createSelection( selObj ){
    selObj.length = 0;
    addSelOption( selObj, '', '');
}