function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}
function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}
function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_preloadImages() { //v3.0
 var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
   var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
   if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function isValidPostcode(p) {
	var postcodeRegEx = /[A-Z]{1,2}[0-9]{1,2}[A-Z]{0,1} ?[0-9][A-Z]{2}/i;
	return postcodeRegEx.test(p.toUpperCase());
}

function formatPostcode(p) {
	var postcodeRegEx = /(^[A-Z]{1,2}[0-9]{1,2}[A-Z]{0,1})([0-9][A-Z]{2}$)/i;
	return p.toUpperCase().replace(postcodeRegEx,"$1 $2");
}

function xmlRequestObject() {
	var agt		= navigator.userAgent.toLowerCase();
	var is_major 	= parseInt(navigator.appVersion);
	var is_minor 	= parseFloat(navigator.appVersion);
	var is_ie     	= ((agt.indexOf("msie") != -1) && (agt.indexOf("opera") == -1));
	var is_ie3    	= (is_ie && (is_major < 4));
	var is_ie4    	= (is_ie && (is_major == 4) && (agt.indexOf("msie 4")!=-1) );
	var is_ie4up  	= (is_ie && (is_major >= 4));
	var is_ie5    	= (is_ie && (is_major == 4) && (agt.indexOf("msie 5.0")!=-1) );
	var is_ie5_5  	= (is_ie && (is_major == 4) && (agt.indexOf("msie 5.5") !=-1));
	var is_ie5up  	= (is_ie && !is_ie3 && !is_ie4);
	var is_ie5_5up 	= (is_ie && !is_ie3 && !is_ie4 && !is_ie5);
	var is_ie6    	= (is_ie && (is_major == 4) && (agt.indexOf("msie 6.")!=-1) );
	var is_ie6up  	= (is_ie && !is_ie3 && !is_ie4 && !is_ie5 && !is_ie5_5);
	if (is_ie5) return new ActiveXObject('Msxml2.XMLHTTP');
	else if(is_ie5_5up) return new ActiveXObject('Microsoft.XMLHTTP');
	var o = new XMLHttpRequest();
	if (typeof(o) != 'undefined') return o;
	alert("couldn't instantiate XMLHttpRequest object");
	return false;
}
							
function getAddressFromPostcode(postcode){
	
	var address = new Array();
	address['street1']  = '';
	address['district'] = '';
	address['town']    	= '';
	address['county']   = '';
	address['country']  = '';
	address['gride']   	= '';
	address['gridn']   	= '';
	address['error']     = "";

	var xmlhttp  = new xmlRequestObject();
	
	xmlhttp.open("GET", "/joining/pc.php?postcode=" + escape(postcode) ,false);
	xmlhttp.send(null);

	if (xmlhttp.status == 200)
	{
		xmldata       = xmlhttp.responseXML;
    	xml_address  = xmldata.getElementsByTagName('address').length; 
    	xml_error     = xmldata.getElementsByTagName('error').length; 
	    	
		if(xmldata.getElementsByTagName('error')[0])
		{
			address['error']     = xmldata.getElementsByTagName('error')[0].firstChild.data;
		}
		else
		{
			for(var i = 0; i < xml_address; i++)
			{
				for( var j=0; j < xmldata.getElementsByTagName('address')[i].attributes.length; j++ )
				{
					address[xmldata.getElementsByTagName('address')[i].attributes[j].name] = xmldata.getElementsByTagName('address')[i].attributes[j].value;
				}
			}
		}
		return address;
	}
	else
	{
		address['error']     = "Unknown Error: " + xmlhttp.status;
		return address;
	}
}

function updateAddress(theForm) {
	
	var err = "";
	
	if( theForm.address_postcode.value.length == 0 )
	{
		return false;
	}
	else
	{
		address = getAddressFromPostcode(theForm.address_postcode.value);
		
		if( address['street1'] != "" )
		{
			theForm.address_street1.value = address['street1'];
			theForm.address_street2.value = '';
			theForm.address_district.value = address['district'];
			theForm.address_town.value = address['town'];
			theForm.address_county.value = address['county'];
			return true;
		}
	}
	theForm.address_street1.value = '';
	theForm.address_street2.value = '';
	theForm.address_district.value = '';
	theForm.address_town.value = '';
	theForm.address_county.value = '';	
	return false;
}