Aqui tienes uno que lo tengo en mi pagina y sale como una solapa...ese codigo lo colocas como un gadget
<style>
#hcr {
position:fixed;
top:300px;
z-index:+1000;
}
* html #hcr {position:relative;}
.hcrtab {
height:100px;
width:30px;
float:left;
cursor
ointer;
background:url('https://dl.dropboxusercontent.com/u/4594548/chat.png') no-repeat;
}
.hcrcontent {
float:left;
border:2px solid #008DFF;
background:#81BEED;
padding:10px;
}
.hc-credit {font-size:9px}
.hc-credit a {text-decoration:none}
</style>
<script type="text/javascript">
function showHidehcr(){
var hcr = document.getElementById("hcr");
var w = hcr.offsetWidth;
hcr.opened ? movehcr(0, 30-w) : movehcr(20-w, 0);
hcr.opened = !hcr.opened;
}
function movehcr(x0, xf){
var hcr = document.getElementById("hcr");
var dx = Math.abs(x0-xf) > 10 ? 5 : 1;
var dir = xf>x0 ? 1 : -1;
var x = x0 + dx * dir;
hcr.style.right = x.toString() + "px";
if(x0!=xf){setTimeout("movehcr("+x+", "+xf+")", 10);}
}
</script>
<div id="hcr">
<div class="hcrtab" onclick="showHidehcr()"> </div>
<div class="hcrcontent">
<!-- CHAT BOX CODE HERE -->
CHAT DE CHATANGO
<!-- END CHAT BOX CODE --->
<br />
<span style="float:right">
<a href="javascript:showHidehcr()">
[Cerrar]
</a>
</span>
</div>
</div>
<script type="text/javascript">
var hcr = document.getElementById("hcr");
hcr.style.right = (30-hcr.offsetWidth).toString() + "px";
</script>
<div class='clear'></div>
<span class='widget-item-control'>
<span class='item-control blog-admin'>
<a class='quickedit' href='//www.blogger.com/rearrange?blogID=20057109633696963&widgetType=HTML&widgetId=HTML7&action=editWidget§ionId=sidebar' onclick='return _WidgetManager._PopupConfig(document.getElementById("HTML7"));' target='configHTML7' title='Editar'>
</a>
</span>
</span>
<div class='clear'></div>