function checkBCNum()
{
	if ((document.subclubpoints.cust_num.value.length < 11) || (document.subclubpoints.cust_num.value.length > 12) || (IsNumeric(document.subclubpoints.cust_num.value) == false))
	{	alert('Please enter a valid BonusCard number');	return false;	}
	else
	{	document.subclubpoints.submit();	}
}
function IsNumeric(sText)
{
	var ValidChars = "0123456789";
	var IsNumber=true;
	var Char;

	for (i = 0; i < sText.length && IsNumber == true; i++) 
	{ 
		Char = sText.charAt(i); 
		if (ValidChars.indexOf(Char) == -1) 
		{	IsNumber = false;	}
	}
	return IsNumber;
}