var xmlHttp; 
function createXMLHttpRequest() {
    if (window.ActiveXObject) {
        xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
    }
    else if (window.XMLHttpRequest) {
        xmlHttp = new XMLHttpRequest();
    }
}
    
function addSelect(sid,elementID,cookie) {
	//alert(cookie);
    oElement=document.getElementById(elementID);
     createXMLHttpRequest();
var url = "doclass.php?cok="+cookie+"&sid=" + sid;
xmlHttp.onreadystatechange = function(){onStateChange(oElement)};
xmlHttp.open("GET", url, true);
xmlHttp.send(null);
} 
function onStateChange(oElement){
    if(xmlHttp.readyState == 4){
        if(xmlHttp.status == 200){
   var returntxt=unescape(xmlHttp.responseText);
   var htmltxt =returntxt;
   //var htmltxt = '<select name="class2" id="class2">' + returntxt + '</select>';
   var htmltxt = '<select name="class2" id="class2" valid="required" errmsg="请填写项目分类">' + returntxt + '</select>';
    document.getElementById("class2box").innerHTML=htmltxt;
	//if(document.getElementById("class2").value==""){alert(returntxt);}
	//document.getElementById("errMsg_class2").innerHTML="请填写项目";
        }
    }
}


/*function addcity(sid,elementID) {
    oElement=document.getElementById(elementID);
     createXMLHttpRequest();
var url = "city.php?do=city&sid=" + sid;
xmlHttp.onreadystatechange = function(){onStateChangecity(oElement)};
xmlHttp.open("GET", url, true);
xmlHttp.send(null);
} 
function onStateChangecity(oElement){
    if(xmlHttp.readyState == 4){
        if(xmlHttp.status == 200){
   var returntxt=unescape(xmlHttp.responseText);
   var htmltxt =returntxt;
   //var htmltxt = '<select name="class2" id="class2">' + returntxt + '</select>';
   var htmltxt = '<select name="f_city" id="f_city" onchange="addarea(this.options[this.selectedIndex].value,\'f_area\')">' + returntxt + '</select>';
    document.getElementById("citybox").innerHTML=htmltxt;
        }
    }
}


function addarea(sid,did,elementID) {
	alert(did);
    oElement=document.getElementById(elementID);
     createXMLHttpRequest();
var url = "city.php?do=area&did="+did+"&cid=" + sid;
xmlHttp.onreadystatechange = function(){onStateChangearea(oElement)};
xmlHttp.open("GET", url, true);
xmlHttp.send(null);
} 
function onStateChangearea(oElement){
    if(xmlHttp.readyState == 4){
        if(xmlHttp.status == 200){
   var returntxt=unescape(xmlHttp.responseText);
   var htmltxt =returntxt;
   //var htmltxt = '<select name="class2" id="class2">' + returntxt + '</select>';
   var htmltxt = '<select name="f_area" id="f_area">' + returntxt + '</select>';
    document.getElementById("areabox").innerHTML=htmltxt;
        }
    }
}
*/