function TearOff( url, name, width, height )
{
	window.name='PUMain';
	window.open(url, name, 'left=200,top=200,personalbar=no,toolbar=no,status=no,scrollbars=yes,resizable=yes,menubar=no,width=' + width + ',height=' + height);
}


function ValidateCCNumber(event, strCreditCardNumber)
{
	var iWeight = 2;
	var iSum = 0;

	for( var iCount = strCreditCardNumber.length  - 2; iCount >= 0; iCount-- )
	{
		var iDigit = iWeight * ( strCreditCardNumber.substr( iCount, 1 ) - '0' );

		iSum = iSum + Math.floor( iDigit / 10 ) + ( iDigit % 10 );

		if ( iWeight == 2 )
			iWeight = 1;
		else
			iWeight = 2;
	}

	iMod = ( 10 - ( iSum % 10 ) ) % 10;

	if ( iMod == ( strCreditCardNumber.substr( strCreditCardNumber.length - 1, 1 ) - '0' ) )
	{
		return true;
	}
	else
	{
		event.returnValue = false;
		event.cancelBubble = true;
		alert ("Invalid credit card number");
	}
}