var xmlHttp

function GetDelivery()
{
xmlHttp=GetXmlHttpObject()
if (xmlHttp==null)
 {
 alert ("Browser does not support HTTP Request")
 return
 }

var CodeInput = document.deliveryform.codeinput;

if (CodeInput.value == '') {
alert ("Please enter the first part of your postcode. Example if your postcode is SN10 5EG, enter SN.")
document.deliveryform.codeinput.focus();
return false;
} else {
	if (CodeInput.value && CodeInput.value.match(/[^-a-zA-Z]/)) {
	  		alert("You may only enter letters in the postcode field");
	 		return false;
 		} 
}


var url="ajax/postcode.php"
url=url+"?CodeInput="+CodeInput.value
url=url+"&sid="+Math.random()
xmlHttp.onreadystatechange=stateChanged
xmlHttp.open("GET",url,true)
xmlHttp.send(null)
}


function stateChanged()
{
if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
 {


document.deliveryform.codeinput.value = '';
document.getElementById('datediv').innerHTML = xmlHttp.responseText;



 }
}

function GetXmlHttpObject()
{
var xmlHttp=null;
try
 {
 // Firefox, Opera 8.0+, Safari
 xmlHttp=new XMLHttpRequest();
 }
catch (e)
 {
 //Internet Explorer
 try
  {
  xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
  }
 catch (e)
  {
  xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
 }
return xmlHttp;
}