Событие onclick

<form method="post" action="index.php?view=pass" style="padding:13% 0px 0px 40%;" name="ba">
        <input type="text" name="old_pass" >
        <input type="submit" name="s_old_pass" value="Старый пароль">
</form>

<style>
.sub_block.full {
display: block;
width: 252px;
margin: 10px 0 10px 0;
padding: 0;
border: 2px dotted rgb(141, 141, 141);
text-align: center;
}
.full {
display: none;
margin-bottom: 20px;
padding-top: 10px;
}
</style>
 
<script type="text/javascript">
$(document).ready(function(){
$('.more').click(function(){
$(this).parent().children('div.full, p.full').toggle('normal');
return false;
});
});
</script>
 
<div class="sub_block full">
<div class="more"><span style="cursor: pointer;">Сменить пароль</span></div>
<div class="full">
<p>Введите пароль:</p>
 
<form method="post" action="index.php?view=pass" style="padding:13% 0px 0px 40%;" name="ba">
        <input type="text" name="old_pass" >
        <input type="submit" name="s_old_pass" value="Старый пароль">
</form>
 
</div>
</div>