function checkQuality(field)
{
var output = document.getElementById('quality');
var pass = field.value; var score = 0;
var punctuations = '!@#$%^&*()~`_-+={}[];:"<>,./?\\\''.split('');
var uppercases = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'.split('');
var lowercases = 'abcdefghijklmnopqrstuvwxyz'.split('');
var hasPunctuation = false;
var hasUppercase = false;
var hasLowercase = false;
var hasNumber = false;
var membership = [];
for (c in punctuations)
{
if (pass.indexOf(punctuations[c]) != -1)
{ score++;
hasPunctuation = true;
membership[pass.indexOf(punctuations[c])] = 'P';
}
}
for (c in uppercases)
{
if (pass.indexOf(uppercases[c]) != -1)
{ score += .5;
hasUppercase = true;
membership[pass.indexOf(uppercases[c])] = 'U';
}
}
for (c in lowercases)
{
if (pass.indexOf(lowercases[c]) != -1)
{
score += .5;
hasLowercase = true;
membership[pass.indexOf(lowercases[c])] = 'L';
}
}
for (c=0;c<=9;c++)
{
if (pass.indexOf(c) != -1)
{
score += .5;
hasNumber = true;
membership[pass.indexOf(c)] = 'N';
}
}
// calculate the "noisyness" of the password
// each transition from one group of symbols to the next adds .25 to the score
// NoI$yNeSs of that string is 4.25
// noisyness of that string is .25
var lastType = '';
for (i in membership)
{
if (lastType != membership[i])
{
score += .25;
lastType = membership[i];
}
}
if (hasPunctuation) score++;
if (hasNumber) score++;
if (hasUppercase) score++;
if (hasLowercase) score++;
if (score < 9) { q = 'Excellent'; color = "greenbar.gif"; }
if (score < 8) { q = 'Very good'; }
if (score < 7) { q = 'Good'; color = "bar.gif"; }
if (score < 6) { q = 'Fair'; }
if (score < 5) { q = 'Poor'; color = "redbar.gif"; }
if (score < 4) { q = 'Very poor'; }
if (score < 2) { q = 'Worthless'; }
var width = ((score*10)/120)*90;
var width2 = 90-width;
output.innerHTML = '
'+q;
}