function checkMail(email) {

    invalidChars = " ~\'^\`\"*+=\\|][(){}$&!%/:,;ç";

    if (email == "") {
        return false;
    }

    for (i=0; i<invalidChars.length; i++) {
        badChar = invalidChars.charAt(i);
        if (email.indexOf(badChar,0) > -1) {
            return false;
        }
    }
	
    lengthOfEmail = email.length;
    if ((email.charAt(lengthOfEmail - 1) == ".") || (email.charAt(lengthOfEmail - 2) == ".")) {
        return false;
    }
	
    Pos = email.indexOf("@",1);
    if (email.charAt(Pos + 1) == ".") {
        return false;
    }
	
    while ((Pos < lengthOfEmail) && ( Pos != -1)) {
        Pos = email.indexOf(".",Pos);
        if (email.charAt(Pos + 1) == ".") {
            return false;
        }
        if (Pos != -1) {
            Pos++;
        }
    }

    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;
}