function checkBank() {
	var b = document.debit.customerAccountNumber.value;

	if ( b == 0 )
	{
		alert( "Geef uw bank / giro rekeningnummer" );
		return false;
	}
	else
	{

		var total = 0;
		b = removeDots( b );

		if ( b > 100000000)
		{
		
			var j = b.length;
			for( var i = 0; i < b.length; i++ ) {
				total += b.charAt( i ) * j;
				j -= 1;
			}
			if( ( total % 11 ) != 0 ) {
				alert( "Ongeldig bank / giro rekeningnummer" );
				return false;
			}
			
		}

	}

}

function removeDots( param ) {
	var l = param.length;
	var bankacct = "";
	for( var i = 0; i < l; i++ ) {
		bankacct += param.charAt( i ) != "." ? param.charAt( i ) : "";
	}
	return bankacct;
}