Ajax 读取页面内容(同一域）

我使用以下JavaScript/Ajax来读取页面内容，此脚本效果很好，但它只加载了shoppingcart.asp页面内容的一半，我希望shoppingcart.asp完全加载然后显示所有网页内容，这可能吗，我可以添加延迟吗？

<script language="Javascript">
  var anUrl = "http://www.abc.com/shoppingcart.asp";
  var myRequest = new XMLHttpRequest();
  callAjax(anUrl);
  function callAjax(url) {
     myRequest.open("GET", url, true);
     myRequest.onreadystatechange = responseAjax;
                 myRequest.setRequestHeader("Cache-Control", "no-cache");
     myRequest.send(null);
  }
  function responseAjax() {
     if(myRequest.readyState == 4) {
        if(myRequest.status == 200) {
            result = myRequest.responseText;
            alert(result);
            alert("we made it");
        } else {
            alert( " An error has occurred: " + myRequest.statusText);
        }
     }
  }
</script>