<! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en" "Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">
<meta http-equiv= "Content-type" content= "text/html; charset=gb2312 "/>
<title> Untitled Document </title>
<script type= "Text/javascript" >
var xmlHttp;
var a =new Array ();
function Createxmlhttprequest () {
if (window. ActiveXObject) {
Xmlhttp=new ActiveXObject ("Microsoft.XMLHTTP");
}
else if (window. XMLHttpRequest) {
Xmlhttp=new XMLHttpRequest ();
}
}
function Send_request () {
Createxmlhttprequest ();
var year = document.getElementById ("year");
var url = "check_2.php?page=" +escape (Year.value);
Xmlhttp.open ("Get", url,true);
Xmlhttp.onreadystatechange = Checkit;
Xmlhttp.send (NULL);
}
function Checkit () {
if (xmlhttp.readystate = = 4) {
if (Xmlhttp.status = = 200) {
Showchild ();
}
}
}
function Showchild () {
var xmldoc=xmlhttp.responsexml;
var content=xmldoc.getelementsbytagname ("City");
for (Var i=0;i<content.length;i++) {
var y=content[i];
A[i]=y.childnodes[0].data;
}
Show1 ();
}
function Show1 () {
var Obj=document.getelementbyid ("name");
var number=obj.length;
for (Var j=obj.length-1;j>=0;j--) {
Obj.removechild (Obj.childNodes.item (j));
}
for (Var i=0;i<a.length;i++) {
var opt=document.createelement ("option");
Opt.text=a[i];
Obj.add (opt);
}
}
</script>
<body>
Years: <select id= "Year" onchange= "Send_request ()" >
<option value= "0" > Please select </option>
<option value= "1" >1996-2006</option>
<option value= "2" >1986-1995</option>
<option value= "3" >1971-1985</option>
<option value= "4" >1970 before </option>
</select>
Sub-directory: <select id= "Name" >
<option value= "0" > Please select </option>
</select>
</body>
