asp+ajax+ภาษาไทย...ผมเขียนด้วย asp ครับ แต่ค่าคืนกลับมา ภาษาไทยมันไม่แสดงน่ะครับ ต้องแก้ยังไงครับ ขอบคุณมากครับ

    <script type="text/javascript">     
        var xmlHttp;
		var xmlHttp = false;
        var completeDiv;
        var inputField;
        var nameTable;
        var nameTableBody;
		var p;
		var name=new String();

        function createXMLHttpRequest() {
		xmlHttp = false;
            if (window.ActiveXObject) {
                xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
            }
            else if (window.XMLHttpRequest) {
                xmlHttp = new XMLHttpRequest();                
            }
        }

        function initVars() {
		xmlHttp = false;
            inputField = document.getElementById("txtnames");            
            nameTable = document.getElementById("name_table");
            completeDiv = document.getElementById("popup");
            nameTableBody = document.getElementById("name_table_body");
        }

        function findNames() {

            initVars();
            if (inputField.value.length > 0) {
                createXMLHttpRequest();            
                var url = "CompleteData.asp?names=" + inputField.value;                        
                xmlHttp.open("GET", url, true);
				xmlHttp.setRequestHeader("Content-Type", "text/plain;charset=Windows-874");
				xmlHttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
				xmlHttp.onreadystatechange = callback;
                xmlHttp.send(null);
            } else {
                clearNames();
            }
        }

        function callback() {
            if (xmlHttp.readyState == 4) {
                if (xmlHttp.status == 200) {
					name =  document.getElementById("popup").innerHTML = xmlHttp.responseText;
					setNames();
                } else if (xmlHttp.status == 204){
                    clearNames();
                }
            }
        }
        
        function setNames() {         
           	p = name.split(",");  
            clearNames();
   	        var size = p.length;
            setOffsets();
            var row, cell, txtNode;
            for (var i = 0; i < size; i++) {
                var nextNode =p[i] 
                row = document.createElement("tr");
                cell = document.createElement("td");
                
                cell.onmouseout = function() {this.className='mouseOver';};
                cell.onmouseover = function() {this.className='mouseOut';};
                cell.setAttribute("bgcolor", "#FFFAFA");
                cell.setAttribute("border", "0");
                cell.onclick = function() { populateName(this); } ;                             

                txtNode = document.createTextNode(nextNode);
                cell.appendChild(txtNode);
                row.appendChild(cell);
                nameTableBody.appendChild(row);
				
            }
        }

        function setOffsets() {
            var end = inputField.offsetWidth;
            var left = calculateOffsetLeft(inputField);
            var top = calculateOffsetTop(inputField) + inputField.offsetHeight;

            nameTable.style.border = "black 1px solid";
            nameTable.style.left = left + "px";
            nameTable.style.top = top + "px";
            nameTable.style.width = end + "px";
        }
        
        function calculateOffsetLeft(field) {
          return calculateOffset(field, "offsetLeft");
        }

        function calculateOffsetTop(field) {
          return calculateOffset(field, "offsetTop");
        }

        function calculateOffset(field, attr) {
          var offset = 0;
          while(field) {
            offset += field[attr]; 
            field = field.offsetParent;
          }
          return offset;
        }

        function populateName(cell) {
            inputField.value = cell.firstChild.nodeValue;
            clearNames();
        }

        function clearNames() {
            var ind = nameTableBody.childNodes.length;
            for (var i = ind - 1; i >= 0 ; i--) {
                 nameTableBody.removeChild(nameTableBody.childNodes[i]);
            }
                 completeDiv.style.border = "none";
        }
    </script>