var timestamp = new Date().getTime();
var orderNumber = timestamp + Math.floor(Math.random()*100001);
var url = "http://www.permission.co.nz/webinar/thankyou.php?v=";

function onLoad() {	
	document.getElementById("orderNumber").value = orderNumber;
	document.getElementById("redirect").value = url + "5&o=" + orderNumber;
}

function updateRedirect() {
	var firstname = document.getElementById("firstname").value;
	var email = document.getElementById("from").value;
	
	document.getElementById("redirect").value += "&firstname=" + firstname + "&email=" + email;
}