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