// JavaScript Document

var xmlHttp

function postcodeLookup(pc)
{
	document.getElementById('hidden_installation_option').value=0;
	xmlHttp=GetXmlHttpObject()
	if (xmlHttp==null)
 	{
		alert ("Browser does not support HTTP Request")
		return
	}
	var url="postcode_lookup.php?postcode="+pc.value;
	xmlHttp.onreadystatechange=stateChanged 
	xmlHttp.open("GET",url,true)
	xmlHttp.send(null)
}

function stateChanged()
{
	var browserName=navigator.appName;
	var dC = document.getElementById("loading_content");
	if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
	{
		eval(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;
}