IE7 에서 appendChild bug

function writeZip(zipcode, addr_stan){

var tbody=document.createElement("tbody");

var listZipElm = document.getElementById("zipcodeTable");

var itemElm = document.createElement("tr");

itemElm.className = "zipcodeList";

var zipElm = document.createElement("td");

zipElm.className = "zipcode_name";

zipElm.innerHTML = "<a href='#' onclick='setZipcode(\""+ zipcode +"\",\""+addr_stan+"\");'>"+zipcode+"</a>";

//zipElm.innerHTML = zipcode;

zipElm.setAttribute("align","left");

var addrElm = document.createElement("td");

addrElm.className="addr_name";

addrElm.innerHTML = addr_stan;

addrElm.setAttribute("align","left");

itemElm.appendChild(zipElm);

itemElm.appendChild(addrElm);

tbody.appendChild(itemElm);

listZipElm.appendChild(tbody);

}