var whitespace = " \t\n\r"; 
function isEmpty(s)
 {
 return ((s == null) || (s.length == 0)) 
} 
function isWhitespace (s) 
{
	 var i;
	 if (isEmpty(s)) return true;
	 for (i = 0; i < s.length; i++) 
	{ // Check that current character isn't whitespace.
		 var c = s.charAt(i);
		 if (whitespace.indexOf(c) == -1) return false; 
	} // All characters are whitespace. 
return true;
 } 
function isEmail (s) 
{ 
if (isEmpty(s))  if (isEmail.arguments.length == 1) return defaultEmptyOK; 
 else return (isEmail.arguments[1] == true);
 if (isWhitespace(s)) return false; // there must be >= 1 character before @, so we // start looking at character position 1 // (i.e. second character)
 var i = 1; 
var sLength = s.length; // look for @ 
while ((i < sLength) && (s.charAt(i) != "@"))
 { i++; }
 if ((i >= sLength) || (s.charAt(i) != "@")) return false;
 else i += 2; // look for . 
while ((i < sLength) && (s.charAt(i) != "."))
 { i++; } // there must be at least one character after the .
 if ((i >= sLength - 1) || (s.charAt(i) != ".")) return false;
 else return true;
 }