var http_request=false;
	var reobj;
  function send_request(url)
  {//初始化，指定处理函数，发送请求的函数
  	http_request=false;
	//开始初始化XMLHttpRequest对象
	if(window.XMLHttpRequest)
	{//Mozilla浏览器
		 http_request=new XMLHttpRequest();
		 if(http_request.overrideMimeType)
		 {//设置MIME类别
		   http_request.overrideMimeType("text/xml;charset=gb2312");
		 }
    }
	else if(window.ActiveXObject)
	{//IE浏览器
	 	try
	 	{
	  		http_request=new ActiveXObject("Msxml2.XMLHttp");
	 	}
	 catch(e)
	 	{
		 	 try
		 	 {
		  		http_request=new ActiveXobject("Microsoft.XMLHttp");
		  	}catch(e)
		  	{
		  		
		  	}
	 	}
    }
	if(!http_request)
	{//异常，创建对象实例失败
		 window.alert("创建XMLHttp对象失败！");
		 return false;
	}
	http_request.onreadystatechange=processrequest;
	//确定发送请求方式，URL，及是否同步执行下段代码
    http_request.open("GET",url,true);
	http_request.send(null);
  }
  //处理返回信息的函数
  function processrequest()
  {
   if(http_request.readyState==4)
   	{//判断对象状态
     	if(http_request.status==200)
     	{//信息已成功返回，开始处理信息
		 document.getElementById(reobj).innerHTML=http_request.responseText;
 		}
		else
		{//页面不正常
		  alert("您所请求的页面不正常！");
		}
   	}
 }
function getCarList(objCar,cartype)
{
	  var cbd;
	  if(cartype=="1")
	  {
			var	cbd=$("sel_CarBrand").value;
			send_request("getCarsList.php?cbd="+cbd+"&type=1"+"&nocache="+new Date().getTime());
			reobj=objCar;
//			if(cbd=="")//如果用户选择的是选择品牌
//			{
//				cbd="";
//			}
//			else
//			{ 
//				send_request("getCarsList.php?cbd="+cbd+"&type=1"+"&nocache="+new Date().getTime());
//				reobj=objCar;
//			}
	  }else
	  {
			var	cbd=$("sel_CarSeries").value;
			if(cbd=="")
			{
				return null;
			}
			else
			{ 
				send_request("getCarsList.php?cbd="+cbd+"&type=2"+"&nocache="+new Date().getTime());
				reobj=objCar;
			}
	   }
}
function getCarList1(objCar,cartype)
{
	  var cbd;
	  if(cartype=="1")
	  {
			var	cbd=$("sel_CarBrand1").value;
//			if(cbd=="")//如果用户选择的是选择品牌
//			{
//				//return null;
//			}
//			else
//			{ 
				send_request("getCarsList1.php?cbd="+cbd+"&type=1"+"&nocache="+new Date().getTime());
				reobj=objCar;
			//}
	  }else if(cartype=='2')
	  {
			var	css=$("sel_CarSeries1").value;
			send_request("getCarsList1.php?cbd="+css+"&type=2"+"&nocache="+new Date().getTime());
            reobj=objCar;
			if(css=="")
			{
				return null;
			}
			else
			{ 
				send_request("getCarsList1.php?cbd="+css+"&type=2"+"&nocache="+new Date().getTime());
				reobj=objCar;
			}
	   }
}

function getCarSeries(objCar,cartype)
{
	  var cbd;
	  if(cartype=="1")
	  {
			var	cbd=$("sel_CarBrand1").value;
//			if(cbd=="")//如果用户选择的是选择品牌
//			{
//				//return null;
//			}
//			else
//			{ 
				send_request("getCarSeries.php?cbd="+cbd+"&type=1"+"&nocache="+new Date().getTime());
				reobj=objCar;
			//}
	  }else if(cartype=='2')
	  {
			var	css=$("sel_CarSeries1").value;
			send_request("getCarSeries.php?cbd="+css+"&type=2"+"&nocache="+new Date().getTime());
            reobj=objCar;
			if(css=="")
			{
				return null;
			}
			else
			{ 
				send_request("getCarsList1.php?cbd="+css+"&type=2"+"&nocache="+new Date().getTime());
				reobj=objCar;
			}
	   }
}

function getclass(objCar,cartype){
	  var cbd;
	  if(cartype=="1")
	  {
			var	cbd=$("sel_CarBrand").value;
			if(cbd=="")
			{
			return null;
			}else
			{
			 send_request("getCar.php?cbd="+cbd+"&type=1"+"&nocache="+new Date().getTime());
						reobj=objCar;
			}
	  }else
	  {
			var	cbd=$("sel_CarSeries").value;
			if(cbd=="")
			{
			
			return null;
			}else
			{
				 send_request("getCar.php?cbd="+cbd+"&type=2"+"&nocache="+new Date().getTime());
				 reobj=objCar;
			}
	   }
  }
  function getCar(objCar)
  {
	         var cbd;
			var cbd=$("sel_CarBrand").value;

			if(cbd=="")
			{
				
			return null;
			}else
			{
			send_request("getCar.php?cbd="+cbd+"&type=3"+"&nocache="+new Date().getTime());
  	 		reobj=objCar;	
			}
  }