js事项二级联动菜单

<td class="td1" width="20%">
									<div align="right"><span style="color: red;">*</span>采纳类型</div>
								</td>

								<td width="15%">
									<html:select property="ifAdopt" styleId="ifAdoptID" onchange="aaa();">
										<html:option value="">--请选择--</html:option>
										<html:option value="1">采用</html:option>
										<html:option value="2">部分采用</html:option>
										<html:option value="3">不予采用</html:option>										
									</html:select>
								</td>
								
								<td class="td1" width="20%">
									<div align="right"><span style="color: red;">*</span>采用类型：</div>
								</td>

								<td width="15%">
									<html:select property="adoptType" styleId="adoptType">
										<html:option value="-1">--请选择--</html:option>
										<html:option value="1">媒体采用</html:option>
										<html:option value="2">信息摘编</html:option>										
										<html:option value="9">其它</html:option>										
									</html:select>
								</td>

js页面：

function changeObserv(){
 var temp =document.all.district.value; 

 document.getElementById("DeviceIP").value=temp; 
}

var city=[
	 ["审批大厅"],
	 ["白旗","二连","黄旗","东苏","西苏","多伦","蓝旗","乌拉盖","西乌旗","东乌旗"],
	 ["盟农机监理分厅 ","盟交警和车辆管理分厅","市交警车辆管理分厅","盟劳动和社会保障分厅"]
	 ];
	function getVideo(){
	 var sltProvince=document.getElementById("area");
	 var sltCity=document.getElementById("district");
	 var provinceCity=city[sltProvince.selectedIndex-1];
	 sltCity.length=1;
	 for(var i=0;i<provinceCity.length;i++){
	 var ip = "";
	 if(provinceCity[i]=="审批大厅") 
	 	ip = "10.27.56.110";
	 else if(provinceCity[i]=="白旗") 
	 	ip = "10.27.178.50";
	 else if(provinceCity[i]=="二连") 
	 	ip = "10.30.0.8";
	 else if(provinceCity[i]=="黄旗") 
	 	ip = "10.27.198.188";	
	 else if(provinceCity[i]=="东苏") 
	 	ip = "10.27.121.37";
	 else if(provinceCity[i]=="多伦") 
	 	ip = "10.27.168.189";	
	 else if(provinceCity[i]=="西苏") 
	 	ip = "10.27.129.135";
	 else if(provinceCity[i]=="蓝旗") 
	 	ip = "10.27.161.30";	 
	 else if(provinceCity[i]=="乌拉盖") 
	 	ip = "10.27.112.72";	
	 else if(provinceCity[i]=="西乌旗") 
	 	ip = "10.27.159.20";
	 else if(provinceCity[i]=="东乌旗") 
	 	ip = "10.27.145.68";	
	 else if(provinceCity[i]=="盟农机监理分厅") 
	 	ip = "10.27.101.175";	 
	 else if(provinceCity[i]=="盟交警和车辆管理分厅 ") 
	 	ip = "10.27.100.253";	
	 else if(provinceCity[i]=="市交警车辆管理分厅") 
	 	ip = "10.27.25.79";
	 else if(provinceCity[i]=="盟劳动和社会保障分厅") 
	 	ip = "10.27.25.77";
	
	 sltCity[i+1]=new Option(provinceCity[i],ip);
	 }
	}