// password strength
	function RatePassword(pwd) {
		var strength  = GetPasswordStrength(pwd);
		var strengthPercent = ConvertToPercent(strength);
		document.getElementById("strengthdisplay").innerHTML = GetPasswordStrengthText(strengthPercent);
		var bardisplayGood = document.getElementById("bardisplayGood");
		var bardisplayBad = document.getElementById("bardisplayBad");
		var maxwidth = document.getElementById("bardisplayTable").width;
		var widthGood = 0;
		var widthBad = maxwidth;
		if (strengthPercent >= 80) {
			// anything above 80% is displayed as 100% good
			widthGood = maxwidth;
			widthBad = 0;
		} else if (strengthPercent >=0 && strengthPercent < 100) {
			// between zero and 100 display the ratio
			widthGood = (maxwidth * strengthPercent) / 100;
			widthBad = maxwidth - widthGood;
		}
		bardisplayGood.style.width = widthGood;
		bardisplayBad.style.width = widthBad;
	}
	
      function GetPasswordStrength(pwd) {
            // zero-length passwords cannot be rated
            if (pwd.length == 0) {
                  return -1;
            }
            // passwords that are too short are zero-strong
            if (pwd.length < 6) {
                  return 0;
            }
            var charsSpecial = "";
            var charsLowercase = "";
            var charsUppercase = "";
            var charsNumeric = "";
            var rating = 0;
            var bonus = 0;
            var i;
            
            // characters that follow each other in the alphabet are bad
            var charcode = pwd.charCodeAt(0); 
            for (i=1; i<pwd.length; i++) {
                  var diff = pwd.charCodeAt(i) - charcode;
                  charcode = pwd.charCodeAt(i);
                  if (diff == 1 || diff == -1) {
                        pwd = pwd.substring(0, i) + pwd.substring(i-1, i) + pwd.substring(i+1, pwd.length);
                  }
            }
            
            // put password characters into the right buckets
            for (i=0; i<pwd.length; i++) {
                  if (pwd.charCodeAt(i) >= 'a'.charCodeAt(0) && pwd.charCodeAt(i) <='z'.charCodeAt(0)) {
                        charsLowercase += pwd.substring(i, i+1);
                  } else if (pwd.charCodeAt(i) >= 'A'.charCodeAt(0) && pwd.charCodeAt(i) <='Z'.charCodeAt(0)) {
                        charsUppercase += pwd.substring(i, i+1);
                  } else if (pwd.charCodeAt(i) >= '0'.charCodeAt(0) && pwd.charCodeAt(i) <='9'.charCodeAt(0)) {
                        charsNumeric += pwd.substring(i, i+1);
                  } else {
                        charsSpecial += pwd.substring(i, i+1);
                  }
            }
                        
            rating = GetDistribution(charsLowercase);
            rating += GetDistribution(charsUppercase);
            rating += GetDistribution(charsNumeric);
            rating += GetDistribution(charsSpecial);
            
            if (charsLowercase.length > 0) bonus++;
            if (charsUppercase.length > 0) bonus++;
            if (charsNumeric.length > 0) bonus++;
            if (charsSpecial.length > 0) bonus++;
            
            rating = rating * (1 + ((bonus-1) / 4));
            return rating;
      }

	function ConvertToPercent(strength) {
		return 6*strength;
	}
		
	function GetDistribution(str) {
		var distribution = 0;
		var uniques = "";
		var i;
		for (i=0; i < str.length; i++) {
			if (uniques.indexOf(str.substring(i, i+1)) == -1) {
				uniques += str.substring(i, i+1);
			}
		}
		return uniques.length + ((str.length - uniques.length) / 5);
	}
	
	function GetPasswordStrengthText(strength) {
		if (strength == 0) {
			return "Trop court";
		} else if (strength > 0 && strength < 20) {
			return "Trop simple";
		} else if (strength >= 20 && strength < 40) {
			return "Simple";
		} else if (strength >= 40 && strength < 60) {
			return "Bonne";
		} else if (strength >= 60 && strength < 80) {
			return "Complexe";
		} else if (strength >= 80) {
			return "Très complexe";
		} else {
			return "Nulle";
		}
	}