function ValidEmail(email) {
    invalidChars = "/:,;"
	
	var message = "Please enter a valid Email Address";
	
    for (i=0;i<invalidChars.length;i++) {
        badChar = invalidChars.charAt(i)
        if (email.indexOf(badChar,0) > -1) {
			alert(message);
            return false
        }
    }
    atPos = email.indexOf("@",1)
    if (atPos == -1) {
		alert(message);
        return false
    }
    if (email.indexOf("@",atPos+1) > -1) {
		alert(message);
        return false
    }
    periodPos = email.indexOf(".",atPos)
    if (periodPos == -1) {
		alert(message);
        return false
    }
    if (periodPos+3 > email.length) {
		alert(message);
        return false
    }
    return true

}