function passwordStrength(password) {
    var desc = new Array();
    desc[0] = "Very Weak";
    desc[1] = "Weak";
    desc[2] = "Better";
    desc[3] = "Medium";
    desc[4] = "Strong";
    desc[5] = "Strongest";

    var score = 0;

    //if password bigger than 6 give 1 point
    if (password.length > 6) score++;

    //if password has both lower and uppercase characters give 1 point	
    if ((password.match(/[a-z]/)) && (password.match(/[A-Z]/))) score++;

    //if password has at least one number give 1 point
    if (password.match(/\d+/)) score++;

    //if password has at least one special caracther give 1 point
    if (password.match(/.[!,@,#,$,%,^,&,*,?,_,~,-,(,)]/)) score++;

    //if password bigger than 12 give another 1 point
    if (password.length > 12) score++;

    document.getElementById("passwordDescription").innerHTML = desc[score];
    document.getElementById("passwordStrength").className = "strength" + score;
}