Hi i have a ajax function but its not working. I am new to ajax. I cannot use a Jquery or Prototype or mootools equivalent of this code they all conflict with my website.

here is my code:
HTML Code:
me.emailCheckout = function() {
    var div = me.updateCartView( document.createElement("diver") );
    diver = "<div class='StoreCart_items'>" + div.innerHTML + "</div>";
    var buyersalute = getElementById("buyersalute");
    var buyerfirstname = getElementById("buyerfirstname");
    var buyerlastname = getElementById("buyerlastname");
    var buyerstreet = getElementById("buyerstreet");
    var buyertown = getElementById("buyertown");
    var buyerregion = getElementById("buyerregion");
    var buyercountry = getElementById("buyercountry");
    var buyerpostalcode = getElementById("buyerpostalcode");
    var buyercontact = getElementById("buyercontact");
    var buyermobile = getElementById("buyermobile");
    var buyeremail = getElementById("buyeremail");
    var buyerprefpay = getElementById("buyerprefpay");
    var buyerspecreq = getElementById("buyerspecreq");
    var adminemail = getElementById("adminemail");
    var adminstorename = getElementById("adminstorename");
   
var xmlhttp;
if (window.XMLHttpRequest)
  {// code for IE7+, Firefox, Chrome, Opera, Safari
  xmlhttp=new XMLHttpRequest();
  }
else
  {// code for IE6, IE5
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
xmlhttp.onreadystatechange=function()
  {
  if (xmlhttp.readyState==4 && xmlhttp.status==200)
    {
    document.getElementById("theResponce").innerHTML=xmlhttp.responseText;
    }
  }
xmlhttp.open("POST","email.php",true);
xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded");
xmlhttp.send("div=diver&buyersalute=buyersalute&buyerfirstname=buyerfirstname&buyerlastname=buyerlastname&buyerstreet=buyerstreet&buyertown=buyertown&buyerregion=buyerregion&buyercountry=buyercountry&buyerpostalcode=buyerpostalcode&buyercontact=buyercontact&buyermobile=buyermobile&buyeremail=buyeremail&buyerprefpay=buyerprefpay&buyerspecreq=buyerspecreq&adminemail=adminemail&adminstorename=adminstorename");
};