function changsheng(va)
					{
                       
						if(va!='0')
						{
			            var city = document.getElementById("shi");
			                city.disabled=false;
			            var qu = document.getElementById("qu");
			                qu.disabled=true;
						    var f=document.getElementById("qu");
						    f.options.length=1;
						    var url="Handler.ashx?type=sheng&id="+va;
						    send_request("GET",url,null,"text",populateClass3);
						}
					}
					function populateClass3(){
					    var f=document.getElementById("shi");
					    if(http_request.readyState==4){
						        if(http_request.status==200){
							        var list=http_request.responseText;
							        var classList=list.split("|");
							        f.options.length=1;
							        for(var i=0;i<classList.length;i++){
								        var tmp=classList[i].split(",");
								        f.add(new Option(tmp[1],tmp[0]));
							        }
						        }else{
							        alert("您选择省。");
						        }
					    }
					}
					function changshi(va)
					{
					    if(va!='0')
					    {
					    var qu = document.getElementById("qu");
			                qu.disabled=false;
					    
					        var url="Handler.ashx?type=shi&id="+va;
						    send_request("GET",url,null,"text",populateClass4);
						    
					    }
					}
					function populateClass4(){
					    var f=document.getElementById("qu");
					    if(http_request.readyState==4){
						    if(http_request.status==200){
							    var list=http_request.responseText;
							    var classList=list.split("|");
							    f.options.length=1;
							    for(var i=0;i<classList.length;i++){
								    var tmp=classList[i].split(",");
								    f.add(new Option(tmp[1],tmp[0]));
							    }
						    }else{
							    alert("您所请求的页面有异常2。");
						    }
					    }
			        }