<script src="http://jqueryjs.googlecode.com/files/jquery-1.2.6.min.js" type="text/javascript"></script>   

<script type="text/javascript">   
$.fn.passwordStrength = function( options ){   
return this.each(function(){   
var that = this;that.opts = {};   
that.opts = $.extend({}, $.fn.passwordStrength.defaults, options);   

that.div = $(that.opts.targetDiv);   
that.defaultClass = that.div.attr('class');   

that.percents = (that.opts.classes.length) ? 100 / that.opts.classes.length : 100;   

v = $(this)   
.keyup(function(){   
if( typeof el == "undefined" )   
this.el = $(this);   
var s = getPasswordStrength (this.value);   
var p = this.percents;   
var t = Math.floor( s / p );   

if( 100 <= s )   
t = this.opts.classes.length - 1;   

this.div   
.removeAttr('class')   
.addClass( this.defaultClass )   
.addClass( this.opts.classes[ t ] );   

})   
.after('')   
.next()   
.click(function(){   
$(this).prev().val ( randomPassword() ).trigger('keyup');   
return false;   
});   
});   

function getPasswordStrength(H){   
var D=(H.length);   
if(D>5){   
D=5   
}   
var F=H.replace(/[0-9]/g,"");   
var G=(H.length-F.length);   
if(G>3){G=3}   
var A=H.replace(/\W/g,"");   
var C=(H.length-A.length);   
if(C>3){C=3}   
var B=H.replace(/[A-Z]/g,"");   
var I=(H.length-B.length);   
if(I>3){I=3}   
var E=((D*10)-20)+(G*10)+(C*15)+(I*10);   
if(E<0){E=0}   
if(E>100){E=100}   
return E   
}   

function randomPassword() {   
var chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$_+";   
var size = 10;   
var i = 1;   
var ret = ""   
while ( i <= size ) {   
$max = chars.length-1;   
$num = Math.floor(Math.random()*$max);   
$temp = chars.substr($num, 1);   
ret += $temp;   
i++;   
}   
return ret;   
}   

};   

$.fn.passwordStrength.defaults = {   
classes : Array('is10','is20','is30','is40','is50','is60','is70','is80','is90','is100'),   
targetDiv : '#passwordStrengthDiv',   
cache : {}   
}   
$(document)   
.ready(function(){   
$('input[name="password"]').passwordStrength();   
});   
</script>   

2.CSS   
.is0{background:url("http://s58.radikal.ru/i161/0902/1e/827549f7747a.png") no-repeat 0 0;width:138px;height:7px;}   
.is10{background-position:0 -7px;}   
.is20{background-position:0 -14px;}   
.is30{background-position:0 -21px;}   
.is40{background-position:0 -28px;}   
.is50{background-position:0 -35px;}   
.is60{background-position:0 -42px;}   
.is70{background-position:0 -49px;}   
.is80{background-position:0 -56px;}   
.is90{background-position:0 -63px;}   
.is100{background-position:0 -70px;}   

3.   
Главная » Управление дизайном » Редактирование шаблонов - Форма регистрации пользователей   
Заменяем (по умолчанию):   
<?if($PASSWORD_FL$)?>   
<tr id="siM45"><td class="manTd1" id="siM46">$PASSWORD_SIGN$</td><td class="manTd2" id="siM47">$PASSWORD_FL$</td>   
</tr>   
<?endif?>   

На:   

<?if($PASSWORD_FL$)?>   
<tr id="siM45"><td class="manTd1" id="siM46">$PASSWORD_SIGN$</td><td class="manTd2" id="siM47">$PASSWORD_FL$</td>   
</tr><tr><td>Проверка безопасности: </td><td><div id="passwordStrengthDiv" class="is0"></div></td>   
</tr>   
<?endif?>