// Function that checks whether the provided e-mail address is in a valid format (as specified by RFC 822).
// 
// Arguments:
// emailAddress - The e-mail address to check.
// 
// Returns:
// True if valid, otherwise false.
// 
function CheckEmailValid(emailAddress) {
	// Remember: .* is greedy by default!
	// Note that because Javascript insists that we escape backslashes in strings, all backslashes that we want
	// to put into the regex pattern must actually be doubled up, ie. '\\' will end up being '\' in the actual
	// regex pattern.  This makes for a LOT of backslashes, as we're escaping quite a lot in the actual regex too.
	var reEmailAddress = new RegExp(
		'^' +       // RFC 822 says e-mail addys consist of any CHAR except specials, SPACE and CTLs.
		            // We also have the @ and . to seperate user or hostnames.
		            // CHAR is ASCII 0-127(0x00-7F).  SPACE is ASCII 32(0x20).
		            // CTLs are ASCII 0-31(0x00-1F) and 127(0x7F).  Specials are ( ) < > @ , ; : \ " . [ ]
		            // ASCII 127(0x7F) is a DEL control character - prudent to disallow this in an e-mail address.
		'[^\\x7F\\x80-\\xFF\\x00-\\x20\\(\\)\\<\\>\\@\\,\\;\\:\\\\\\"\\[\\]]+' +
		            // ^ Username... even '(.)@host.com' is ok.
		'\\@' +
		            // ^ @
		'[^\\x7F\\x80-\\xFF\\x00-\\x20\\(\\)\\<\\>\\@\\,\\;\\:\\\\\\"\\[\\]\\.]+' +
		            // ^ Host part 1 (no dots yet): 'blah@(host).com.com'.
		'\\.' +
		            // ^ .
		'[^\\x7F\\x80-\\xFF\\x00-\\x20\\(\\)\\<\\>\\@\\,\\;\\:\\\\\\"\\[\\]\\.]+' +
		'[^\\x7F\\x80-\\xFF\\x00-\\x20\\(\\)\\<\\>\\@\\,\\;\\:\\\\\\"\\[\\]]*' +
		            // ^ Host part 2 (remaining dots allowed): 'blah@host.(com.com)'.
		'$'
	);

	return reEmailAddress.test(emailAddress);
}