function   GetResult(str)   
  {
  var  oBao;    	
  if(window.ActiveXObject)
     {
         oBao=new ActiveXObject("Microsoft.XMLHTTP");
     }
     else if(window.XMLHttpRequest)
     {
         oBao=new window.XMLHttpRequest();
     }
     oBao.open("POST","select.php?sel="+str,false);   
     oBao.send();   

         BuildSel(unescape(oBao.responseText),document.getElementById("chetype"));   

  }   
    
  function   BuildSel(str,sel)   
  {   
          sel.options.length=0;   
 
		  var json = eval(str);
		  var jsonNum = json.length;
          var AryId = new Array();
          var AryName = new Array();
		  sel.options[sel.options.length]=new Option("请选择车型","");
		  for(var i = 0; i<jsonNum; i++){
	      AryId[i] = json[i].id;
	      AryName[i] = json[i].name;
	      //alert(AryId[i]+":"+AryName[i]);
		  sel.options[sel.options.length]=new Option(AryName[i],AryId[i]);
         }
         
  }