Javascript---password strength meter

The html code

<form method="post" action="" id="user_registration" name="user_registration">

  <p><h1>Password strength metter</h1></p>

  <p> 

  <label for="user">Username</label>

<input type="text" name="user" id="user"/>

  </p>

  <p> 

  <label for="name">Name</label>

<input type="text" name="name" id="name"/>

  </p>

  <p> 

  <label for="surname">Surname</label>

<input type="text" name="surname" id="surname"/>

  </p>

  <p> 

  <label for="email">E-mail</label>

<input type="text" name="email" id="email"/>

  </p>

  <p> 

   <label for="pass">Password</label>

<input type="password" name="pass" id="pass" 

onkeyup="passwordStrength(this.value)" />

    

  </p>

  <p> 

  <label for="pass2">Confirm Password</label>

<input type="password" name="pass2" id="pass2"/>

  </p>

  <p>

   <label for="passwordStrength">Password strength</label>

   <div id="passwordDescription">Password not entered</div>

   <div id="passwordStrength" class="strength0"></div>

  </p>

  <p> 

  <input type="submit" name="submit" id="submit" value="Register">

  </p>

</form>

The csss code

#passwordStrength

{

 height:10px;

 display:block;

 float:left;

}



.strength0

{

 width:250px;

 background:#cccccc;

}



.strength1

{

 width:50px;

 background:#ff0000;

}



.strength2

{

 width:100px; 

 background:#ff5f5f;

}



.strength3

{

 width:150px;

 background:#56e500;

}



.strength4

{

 background:#4dcd00;

 width:200px;

}



.strength5

{

 background:#399800;

 width:250px;

}

And finally the javascript code

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;

}