ReferenceError: xmlHttpRequest没有定义，这是因为页脚链接中使用了一些id

基本上我想插入这些值到我的数据库和通过ajax，使页不会刷新，可以插入每条记录。我使用wordpress页面自定义模板，所以这就是为什么公司更新/?更新=

我的表单和java脚本有什么问题请告诉我

<script type="text/javascript">
function ram(){
  var xmlhttp= new xmlHttpRequest();
  xmlhttp.open("GET","company-update/?update="+document.getElementById("update1").value+"&customer_id="+document.getElementById("customerid1").value+"&customer_name="+document.getElementById("customer_name1").value+"&pass="+document.getElementById("pass1").value+"&agree="+document.getElementById("agree1").value,false);
xmlhttp.send(null);
document.getElementById("d1").innerHTML=xmlhttp.responseText;
}
</script>

<section>
  <h4>Type Your Updated Response There</h4>
  <br/><br/>
  <form action="" id="fscf_for" method="post">
  <ul class="input-list style-1 clearfix">
    <li>
      <input type="text" placeholder="Type Your Updated Response There" name="update1" id="update1" value="">
    </li>
    <li>
      <input type="text" name="customer_id1" id="customerid1" value="<?php echo $search;?>">
    </li>
    <li>
      <input type="hidden" name="customer_name1" id="customer_name1" value="<?php echo $r->Name;?>">
    </li> 
    <li>
      <input type="textarea" name="pass1" id="pass1" value="">
    </li>
    <li>
    <label>Mail : YES</label>
<input type='radio' name='agree1' id=='agree1' value='yes' />
<label>NO</label>
<input type='radio' name='agree1' id='agree1' value='no' checked="checked" />
 </li> </ul><br/>
  <input type="button" id="fscf_submi" style="cursor:pointer; margin:0;" value="Update" onclick=" ram();" /> 
  <tr><td colspan="2" align="center"><div id="d1"></div></td></tr>
</form>
</section>`

在每次点击按钮时显示这种错误

在firebug的控制台，所以它看起来这些菜单的id是搞砸了我。所以请帮助我运行这个家伙

ReferenceError: xmlHttpRequest

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Thanks In Advance