Ajax缺少对象,该怎么处理

function showDiv(ojb,kjb,id){
Mid="M"+id;
$.ajax({
   type: "POST",  
   url: "../Domestic/getair.aspx",  
   data: "aircode="+ojb+"&airclass="+kjb,  
   success: function(result){  
    // alert( "Data Saved: " + result );
  displayHotelDiv(result,Mid);
   }
 });
 }
//FlightAjax.js
var thisLayer = document.createElement("div");
with (thisLayer.style) {
    position = "absolute";
    left = "0px";
    top = "0px";
    margin = "0px";
    width = "0%";
    height = "0%";
    //background = "#0066CC";
    //filter = "Alpha(Opacity=30)";
    //padding = "0px";
    //clip = "rect(0px,auto,auto,auto)";
}
thisLayer.setAttribute("onclick",function(){hideDisposeDiv();});
var thisBody = document.getElementsByTagName("body")[0];
var thisDiv = document.createElement("div");
thisDiv.style.position = "absolute";
thisDiv.style.display = "none";
var thisTable = document.createElement("table");
var thisTbody = document.createElement("tbody");
//thisTable.className = "td1";

var thisTr1 = document.createElement("tr");
var thisTr2 = document.createElement("tr");
var thisTr3 = document.createElement("tr");
var thisTr4 = document.createElement("tr");

var thisTd1 = document.createElement("td");
thisTd1.colspan="2";
thisTr1.appendChild(thisTd1);

 
var thisTd3 = document.createElement("td");
var thisTd4 = document.createElement("td");
thisTr2.appendChild(thisTd3);
thisTr2.appendChild(thisTd4);

var thisTd5 = document.createElement("td");
var thisTd6 = document.createElement("td");
thisTr3.appendChild(thisTd5);
thisTr3.appendChild(thisTd6);

var thisTd7 = document.createElement("td");
var thisTd8 = document.createElement("td");
thisTr4.appendChild(thisTd7);
thisTr4.appendChild(thisTd8);

thisTbody.appendChild(thisTr1);
thisTbody.appendChild(thisTr2);
thisTbody.appendChild(thisTr3);
thisTbody.appendChild(thisTr4);

thisTable.appendChild(thisTbody);
thisDiv.appendChild(thisTable);

thisBody.appendChild(thisLayer);
thisBody.appendChild(thisDiv); 

function displayHotelDiv(inputMsg,did){
    var eT=0,eL=0,p=document.getElementById(did);
    thisTable.setAttribute("onclick",function(){hideDisposeDiv();});
    if(document.body.scrollTop!=0 || (document.documentElement.scrollTop==0 && document.documentElement.clientHeight==0))
    {
        var sT=document.body.scrollTop,sL=document.body.scrollLeft;
        var eH=p.height,eW=p.width;
        while(p&&p.tagName!="BODY"){eT+=p.offsetTop;eL+=p.offsetLeft;p=p.offsetParent;}
        thisDiv.style.top=((document.body.clientHeight-(eT-sT)-eH>=25)?eT+eH:eT-25) + "px";
        thisDiv.style.left=((document.body.clientWidth-(eL-sL)>=25)?eL:eL+eW) + "px";    
    }else{
        var sT=document.documentElement.scrollTop,sL=document.documentElement.scrollLeft;
        var eH=p.height,eW=p.width;
        while(p&&p.tagName!="BODY"){eT+=p.offsetTop;eL+=p.offsetLeft;p=p.offsetParent;}
        thisDiv.style.top=((document.documentElement.clientHeight-(eT-sT)-eH>=25)?eT+eH:eT)+18+ "px";
        thisDiv.style.left=((document.documentElement.clientWidth-(eL-sL)>=100)?eL-150:eL+eW) + "px";    
    }
    thisLayer.style.width = "100";
    thisLayer.style.height = "100";
        if (inputMsg != undefined) {
        var count=inputMsg.split(",");
        var info="<table width='300' border='0' cellpadding='0' cellspacing='0' style='BORDER-RIGHT: #A4D1FF 1px solid; BORDER-TOP: #A4D1FF 1px solid; BORDER-LEFT: #A4D1FF 1px solid; BORDER-BOTTOM: #A4D1FF  1px solid; BACKGROUND-COLOR: #EEF7FF;'>";
        info+="<tr><td colspan='2'><table width='280' border='0' align='center' cellpadding='0' cellspacing='0'><tr><td height='28' colspan='2'><b>退改签规定</b></td></tr><tr>";
        info+="<td height='1' colspan='2' bgcolor='#A4D1FF'></td></tr><tr><td height='5' colspan='2' valign='top'></td></tr><tr>";
        info+="<td width='67' height='26' valign='top'><b>更改条件：</b></td><td width='213' valign='top'>"+count[0]+"</td></tr>";
        info+="<tr><td height='26' valign='top'><b>退票条件：</b></td><td valign='top'>"+count[1]+"</td></tr>";
        info+="<tr><td height='26' valign='top'><b>签转条件：</b></td><td valign='top'>"+count[2]+"</td></tr></table></td></tr>";
        info+="</table>";
        info+="<iframe src='javascript:false' frameborder='0' style='position:absolute;top:0px;left:0px; width:380px; height:70px; z-index:-1;'>";
        info+="</iframe>";
        thisDiv.innerHTML=info;
        thisDiv.style.display = "";
    }
}
function hideThisDiv(){
    thisDiv.style.display = "none";
    thisDiv.style.left = 0;
    thisDiv.style.top = 0;
    thisLayer.style.width = "0%";
    thisLayer.style.height = "0%";
}