var whitespace = " \t\n\r";

/*function isEmail (s)
{   
    if (isWhitespace(s)) return false;
    
    var i = 1;
    var sLength = s.length;

    while ((i < sLength) && (s.charAt(i) != "@"))
    { i++
    }

    if ((i >= sLength) || (s.charAt(i) != "@")) return false;
    else i += 2;

    while ((i < sLength) && (s.charAt(i) != "."))
    { i++
    }

    if ((i >= sLength - 1) || (s.charAt(i) != ".")) return false;
    else return true;
}*/

function isEmail(email) {
	var re = /^[a-zA-Z][\w\.-]*[a-zA-Z0-9]@[a-zA-Z0-9][\w\.-]*[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]$/;
	if(email.match(re))
		return true;
	else
		return false;
}


function isWhitespace (s)
{   var i;

    if ((s == null) || (s.length == 0)) return true;

    for (i = 0; i < s.length; i++)
    {   

	var c = s.charAt(i);

	if (whitespace.indexOf(c) == -1) return false;
    }
    return true;
}