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_validateForm() { //v4.0
  var i,p,q,nm,gnm,test,num,min,max,errors='',args=MM_validateForm.arguments;
  for (i=0; i<(args.length-2); i+=3) { gnm=args[i+1]; test=args[i+2]; val=MM_findObj(args[i]);
    if (val) { nm=val.name; if ((val=val.value)!="") { 
      if (test.indexOf('isEmail')!=-1) { p=val.indexOf('@');
        if (p<1 || p==(val.length-1)) errors+='- '+gnm+' must contain an e-mail address.\n';
      } else if (test!='R') { num = parseFloat(val);
        if (isNaN(val)) errors+='- '+gnm+' must contain a number.\n';
        if (test.indexOf('inRange') != -1) { p=test.indexOf(':');
          min=test.substring(8,p); max=test.substring(p+1);
          if (num<min || max<num)
			  errors+='- '+gnm+' must contain a number between '+min+' and '+max+'.\n';
    } } } else if (test.charAt(0) == 'R') errors += '- '+gnm+' is required.\n'; }
  } if (errors) alert('The following error(s) occurred:\n'+errors);
  document.MM_returnValue = (errors == '');
}

function show_form_info() {
	document.getElementById('display_none').style.display='block';
}

function show_address() {
	document.getElementById('address_select').style.display='block';
    document.getElementById('account_select').style.display='none';
}

function hide_address() {
	document.getElementById('address_select').style.display='none';
    document.getElementById('account_select').style.display='block';
}
function selectAddress (tg) {
	if (tg == 1) {
		document.getElementById('display_account_address').className = ""
		document.getElementById('no_specify_address').style.display = 'block';
		document.getElementById('specify_address').style.display = 'none';
	}
	else {
		document.getElementById('display_account_address').className = "deselect_this"
		document.getElementById('no_specify_address').style.display = 'none';
		document.getElementById('specify_address').style.display = 'block';
	}
}

function selectBuyer(pass) {
		var togglethis = document.getElementById(pass);
		var togglethisp = document.getElementById("p_" + pass);

		if (togglethis.value == "business") {
			togglethisp.className = "selectradio";
			document.getElementById("p_radio_personal").className = "";
			document.getElementById("company_select").style.display = "block";
		}
		else {
			togglethisp.className = "selectradio";
			document.getElementById("p_radio_business").className = "";
			document.getElementById("company_select").style.display = "none";
			document.getElementById("company").value = "";
		}
	}
	function amIcheckd(myval) {
		var checkThis = document.getElementById(myval);
		if (checkThis.checked == true) {
			document.getElementById("company_select_req").style.display = "block";
		}
		else {
			document.getElementById("company_select_req").style.display = "none";
			document.getElementById("vatnumber").value = "";
			
		}
	}
	
	function check13B(tickbox_id, number_id)
	{
		var tickbox = document.getElementById(tickbox_id);
		var number = document.getElementById(number_id);
				
		if (tickbox.checked == false)
			return true;
		else if (number.value == '')
		{
			alert('Please ensure you have supplied a 13B number.');
			return false;
		}
		
		return true;
	}