function launch_report(obj) {
    var location = obj.options[obj.selectedIndex].value;
    if (location) {
    document.location.href = location;
    }
}
function backnumber() {
    document.open();
    document.write("<select name=\"hoge\" class=\"form\" onChange=\"launch_report\(this\)\">");
    document.write("<option value=\"\">\バックナンバー");
    document.write("<option value=\"\">\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-");
    var now = new Date();
    var nendo = now.getFullYear();
    if (now.getMonth() < 3) nendo--;
    for (var y = nendo; y >= 2005; y--) {
		document.write('<option value=\"http://www.avix.co.jp/information/' + y + '/index.html\">' + y + '年度');
    }
    document.write("</select>");
    document.close();
}