function singleRadio () {
	if (document.getElementsByName("numoption")[0].checked == true)
	{
		document.getElementById("num1").value = "1";
		document.getElementById("num5").value = "0";
	}
}

function fivePackRadio () {
	if (document.getElementsByName("numoption")[1].checked == true)
	{
		document.getElementById("num1").value = "0";
		document.getElementById("num5").value = "1";
	}
}

function validateDetails() {
	var regAmount = new RegExp ("^[1-9][0-9]*?$");
	var regName = new RegExp ("^[a-z A-Z\-]*$");
	var regEmail = new RegExp ("^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$");
	var pass = true;
	
	
	// Check amount
	if (document.getElementsByName("numoption")[0].checked == true & regAmount.test(document.getElementById("num1").value) == false)
	{
		pass = false;
		document.getElementById("amount1error").innerHTML = "Error: Invalid amount";
	}
	else if (document.getElementsByName("numoption")[1].checked == true & regAmount.test(document.getElementById("num5").value) == false)
	{
		pass = false;
		document.getElementById("amount5error").innerHTML = "Error: Invalid amount";
	}
	else
	{
		document.getElementById("amount1error").innerHTML = "";
		document.getElementById("amount5error").innerHTML = "";
	}
	
	// Check name
	if (document.getElementsByName("detailsname")[0].value == "" || document.getElementsByName("detailsname")[0].value == null)
	{
		pass = false;
		document.getElementById("nameerror").innerHTML = "Error: Please enter your name";
	}
	else if (regName.test(document.getElementsByName("detailsname")[0].value) == false)
	{
		pass = false;
		document.getElementById("nameerror").innerHTML = "Error: Please only use the letters a-z and A-Z";
	}
	else
	{
		document.getElementById("nameerror").innerHTML = "";
	}
	
	// Check email
	if (document.getElementsByName("detailsemail")[0].value == "" || document.getElementsByName("detailsemail")[0].value == null)
	{
		pass = false;
		document.getElementById("emailerror").innerHTML = "Error: Please enter your email";
	}
	else if (regEmail.test(document.getElementsByName("detailsemail")[0].value) == false)
	{
		pass = false;
		document.getElementById("emailerror").innerHTML = "Error: Invalid email address";
	}
	else
	{
		document.getElementById("emailerror").innerHTML = "";
	}
	
	if (pass == true)
		document.form1.submit();
}