function validEmail(email)
{
	invalidChars = "'\" /:,;";
	
	if (email == "")						
		return false;
	
	for (i = 0; i < invalidChars.length; i++)
	{
		badChar = invalidChars.charAt(i)
		if (email.indexOf(badChar, 0) > -1)
			return false;
	}
	
	atPos = email.indexOf("@",1)
	
	if (atPos == -1)
		return false;
	
	if (email.indexOf("@", atPos + 1) != -1)
		return false;
	
	periodPos = email.indexOf(".",atPos)
	
	if (periodPos == -1)				
		return false;
	
	if (periodPos + 3 > email.length)
		return false;
	
	return true;
}