VS2005+Ajax+WebService Div文本框输入提示

var strHTML = "";
    var iCount = 0;
    function GetIE(e) 
    {
        //获取对象的大小及位置
        var t=e.offsetTop; 
        var l=e.offsetLeft; 
        var w=e.offsetWidth; 
        var h=e.offsetHeight; 
        while(e=e.offsetParent) 
        { 
            t+=e.offsetTop; 
            l+=e.offsetLeft; 
        } 
        var re = {Top:t,Left:l,Width:w,Height:h}
        return re; 
    }

    function DoSelect(id,text)
    {
        //完成选择项
        document.getElementById(id).value=text;        //返回选项的值给文本框
        DeleteTip("TipListBox");                    //删除提示窗口
    }
    function SelectItem(Pos,controlId)
    {
        //将焦点给指定位置的项
        //document.write(strHTML);
        var e = document.getElementById("TipListBox_" + controlId + Pos);
        //var e = document.getElementByName("TipListBox_"+Pos);
        
        if(e != null) e.focus();
        event.returnValue = 0;
    }
    function SetFocusStyle(refObj)
    {
        //设置光标所在项的样式
        refObj.style.color="#fff";
        refObj.style.backgroundColor="#0066CC";
        refObj.style.zIndex="150";
    }
    function SetBlurStyle(refObj)
    {
        //恢复光标所在项的样式
        refObj.style.color="#000";
        refObj.style.backgroundColor="";
        refObj.style.zIndex="150";
    }
    function DeleteTip(id)
    {
        //删除提示窗口
        if(document.getElementById(id) != null)
        {
            document.getElementById(id).removeNode(true);
        }
    }
    //取总数
    function CountNum(result)
    {
        iCount=0;
        strHTML="";
        iCount=result;
    }
    //取结果列项
    function GetstrHTML(result)
    {
        strHTML=result;
    }
    
    function ShowTip(refObj,bykeyId,flag)
    {
      
        DeleteTip("TipListBox");        //删除之前的提示窗口
        DeleteTip("Tipiframe"); 
        document.onclick=function()
        {
            //如果鼠标操作不在当前文本框，则将提示窗口删除
            if(event.srcElement.id != refObj.id)
            {
                DeleteTip("TipListBox");
                DeleteTip("Tipiframe"); 
                document.onclick = null;
                
            }
        }
        
        //发站的TextBox对象
        var strkey="";
        if(bykeyId!="")
        {
            var byKeyObj=document.getElementById(bykeyId);
            strkey=byKeyObj.value;
        }
        var currentPos = -1;    //当前选项位置
        var str = refObj.value;                //当前文本框的值
        var eMember = GetIE(refObj);
        
        var eIframe=document.createElement("iframe");
        eIframe.id="Tipiframe"; 
        eIframe.style.cssText ="position:absolute;z-index:9;width:"+eMember.Width+"px;height:130px;top:"+(eMember.Top+eMember.Height)+"px;left:"+eMember.Left+"px;" ;
        eIframe.frameborder="0";
        
        var eWinElement = document.createElement("div");
        eWinElement.id="TipListBox";                        //指定提示窗口ID为TipListBox
        eWinElement.style.cssText = "position:absolute;z-Index:10;overflow:auto;background-Color:#fff;font-size:12px;border:1px solid #000;left:"+eMember.Left+"px;top:"+(eMember.Top+eMember.Height)+"px;width:"+eMember.Width+"px";
//        iCount=0;
//        strHTML="";
        if(flag<2)
        {
            WebService.SearchCount(str, flag, CountNum);
            WebService.SearchList(str, refObj.id,flag, GetstrHTML);
        }
        else
        {
            WebService.EndSearchCount(strkey,str, flag, CountNum);
            WebService.EndSearchList(strkey,str, refObj.id,flag, GetstrHTML);
        }
        if(strHTML == "") return;        //如果没有配匹的值则不显示提示窗口
        eWinElement.style.height="130px"; 
        eWinElement.style.zIndex ="150";
        //document.write(strHTML);
        eWinElement.innerHTML =strHTML;
         document.body.appendChild(eIframe);
        document.body.appendChild(eWinElement);
        if(parseInt(eWinElement.offsetHeight)>120) 
        {
            eWinElement.style.height="150px";  
            eIframe.style.height="150px";  
        }  //定义提示窗口高度
        document.onkeydown=function()
        {
            if(event.keyCode == 40 && currentPos < (iCount-1))
            {
                //向下的按键操作
                SelectItem(++currentPos,refObj.id);
            }
            if(event.keyCode == 38 && currentPos > 0)
            {
                //向上的按键操作
                SelectItem(--currentPos,refObj.id);
            }
            if(event.keyCode != 38 && event.keyCode != 40)
            {
                //其它按钮将当前选项恢复-1的位置
                currentPos = -1;
            }
        }
     }