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
}