Here’s a copy of the code I’ve written and placed on the top of Homes.org. Feel free to use it however you want. Note: I’m not responsible for anything you do with it ;)
<? if(date(‘Ymd’, time()) == ’20120118′ && !$this->session->userdata(‘sopa’)): ?>
<? $this->session->set_userdata(‘sopa’, 1) ?>
<script type=”text/javascript”>
$(window).ready(function(){
$(‘.sopa_wrapper’).delay(200).animate({‘height’:50, ‘padding-top’:25, ‘padding-bottom’: 25});
$(‘.sopa_close’).click(function(){
$(‘.sopa_wrapper’).delay(0).animate({‘height’:0, ‘padding-top’:0, ‘padding-bottom’: 0});
});
});
</script>
<style type=”text/css”>

.sopa_wrapper{
overflow: hidden;
box-shadow: 0px 0px 10px #000;
padding: 0px;
position: fixed;
z-index: 4000000;
top: 0px; width: 100%;
background-image: url(‘http://www.alvincheung.com/sopa/background.png’);
height: 0px;
}

.sopa{
width: 1060px;
margin: 0 auto;
}
.sopa p{
float: left;
width: 700px;
margin: 8px 12px;
text-align: left;
}

.sopa_button{
padding: 8px;
float: left;
color: #fff;
margin: 5px;
position: relative;
top: -20px;
border-radius: 5px;
width: 150px;
text-align: left;
text-decoration: none;
}

.sopa_button.red{
background-color: #c00;
border: 1px solid #900;
}

.sopa_button.red:hover{
border:    1px solid #fff;
box-shadow: 0px 0px 6px #f00;
}

.sopa_button.blue{
background-color: #00c;
border: 1px solid #009;
}

.sopa_button.blue:hover{
border:    1px solid #fff;
box-shadow: 0px 0px 6px #00f;
}

.sopa_close{
float: right;
width: 48px;
height: 48px;
background-image: url(‘http://www.alvincheung.com/sopa/close_bw.png’);
margin: 0 20px;
}

.sopa_close:hover{
background-image: url(‘http://www.alvincheung.com/sopa/close.png’);
cursor: pointer;
}
</style>
<div>
<div>

</div>
<div>
<img src=”http://www.alvincheung.com/sopa/warning.png” style=”float: left;”/>
<p>
SOPA and PIPA damage the internet. Today we fight back. Please take today as a day of focus to
<br />learn about these destructive bills and do what you can to prevent them from becoming a reality.
</p>
<a href=”http://americancensorship.org/modal/call-form.html” rel=”nofollow” target=”_blank”><img src=”http://www.alvincheung.com/sopa/phone_telephone_call.png” />Make a call</a>
<br /><a href=”http://sopastrike.com/modal/strike-modal/index.html” rel=”nofollow” target=”_blank”><img src=”http://www.alvincheung.com/sopa/edit.png” />Sign the petition</a>
</div>
</div>
<? endif ?>