新增多行与原来一摸一样的下拉联动列表
<html>
<head>
<title>List</title>
<meta http-equiv="Content-Type" content="text/html; c
harset=gb2312">
<script defer LANGUAGE="javascript">
<!--
var onecount;
onecount=0;
subcat = new Array();
subcat[0] = new Array("徐汇区","01","001");
subcat[1] = new Array("嘉定区","01","002");
subcat[2] = new Array("黄浦区","01","003");
subcat[3] = new Array("南昌市","02","004");
subcat[4] = new Array("九江市","02","005");
subcat[5] = new Array("上饶市","02","006");
onecount=6;
function changelocation(locationid){
	document.myform.smalllocation.length = 0;
	var locationid=locationid;
	var i;
	document.myform.smalllocation.options[0] = new Option('====所有地区====','');
	for (i=0;i <onecount; i++){
		if (subcat[i][1] == locationid){
			document.myform.smalllocation.options[document.myform.smalllocation.length]
			= new Option(subcat[i][0], subcat[i][2]);
		}
	}
}
/**function getSelect1(){
	
	 var Myform=document.getElementById('myform');
	 
	 var Myfieldset=document.createElement("fieldset");
	 var Myselect1=document.createElement("select");
	 var Myselect2=document.createElement("select");
	 var Myoption1=document.createElement("option");
	 var Myoption2=document.createElement("option");
	 var Myinput=document.createElement("input");
	 
	 Myselect1.options.add(new Option("text","value")); 
	 Myselect1.options.add(new Option("text1","value")); 
	 Myinput.setAttribute("type","text") 
	 Myinput.setAttribute("size","30") 
	 Myinput.setAttribute("name","SearchTxt") 
	 
	 Myselect1.appendChild(Myoption1) 
	 Myselect2.appendChild(Myoption2)  
	 Myfieldset.appendChild(Myselect1) 
	 Myfieldset.appendChild(Myselect2) 
	 Myfieldset.appendChild(Myinput) 
	 Myform.appendChild(Myfieldset) 
	 
}*/
function getSelect1(){
	alert("****")
	 var Myform=document.getElementById('myform');
	 var Myfieldset=document.createElement("fieldset")
	 Myfieldset.innerHTML="<select name="biglocation" onChange="changelocation(document.myform.biglocation.options[document.myform.biglocation.selectedIndex].value)"><option value="01" selected>上海</option><option value="02">江西</option></select><select name="smalllocation"><option selected value="">==所有地区==</option></select><input type="text" name="SearchTxt" size="30" id="SearchTxt" />  <input type="button" class="input-btn"  value="add" onclick="getSelect1()"/>"