function setPrefComboBox(){
	document.search_form.pref_combo.length = 3;
	document.search_form.pref_combo.options[0].text = "�ȉ����I���@�@�@�@";
	document.search_form.pref_combo.options[0].value = "";

	document.search_form.pref_combo.options[1].text = "�_�ސ쌧";
	document.search_form.pref_combo.options[1].value = "�_�ސ쌧";

	document.search_form.pref_combo.options[2].text = "���s�{";
	document.search_form.pref_combo.options[2].value = "���s�{";

	document.search_form.pref_combo.disabled = false;
	document.search_form.addr_combo.disabled = false;
}

function onChangePrefCombo(){
	var strPref = document.search_form.pref_combo.options[document.search_form.pref_combo.selectedIndex].value;
	document.search_form.addr_combo.length = 1;
	document.search_form.addr_combo.options[0].text = "�ȉ����I���@�@�@�@";
	document.search_form.addr_combo.options[0].value = "";
	switch(strPref){

	case '�_�ސ쌧':
		document.search_form.addr_combo.length = 7;

		document.search_form.addr_combo.options[1].text = "���l�s����";
		document.search_form.addr_combo.options[1].value = "���l�s����";

		document.search_form.addr_combo.options[2].text = "���l�s���";
		document.search_form.addr_combo.options[2].value = "���l�s���";

		document.search_form.addr_combo.options[3].text = "���l�s�`�k��";
		document.search_form.addr_combo.options[3].value = "���l�s�`�k��";

		document.search_form.addr_combo.options[4].text = "���l�s�`���";
		document.search_form.addr_combo.options[4].value = "���l�s�`���";

		document.search_form.addr_combo.options[5].text = "���l�s�_�ސ��";
		document.search_form.addr_combo.options[5].value = "���l�s�_�ސ��";

		document.search_form.addr_combo.options[6].text = "���l�s����";
		document.search_form.addr_combo.options[6].value = "���l�s����";

		break;

	case '���s�{':
		document.search_form.addr_combo.length = 5;

		document.search_form.addr_combo.options[1].text = "���s�s�㋞��";
		document.search_form.addr_combo.options[1].value = "���s�s�㋞��";

		document.search_form.addr_combo.options[2].text = "���s�s������";
		document.search_form.addr_combo.options[2].value = "���s�s������";

		document.search_form.addr_combo.options[3].text = "���s�s�E����";
		document.search_form.addr_combo.options[3].value = "���s�s�E����";

		document.search_form.addr_combo.options[4].text = "���s�s�R�ȋ�";
		document.search_form.addr_combo.options[4].value = "���s�s�R�ȋ�";

		break;

	default:
		break;
	}
}