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
}