<style>
    #chat{position:fixed; top:0px; left:1px;}
    .bt{background:url('http://cdn1.iconfinder.com/data/icons/androiddevicons/dialog.png') no-repeat; width: 48px; height: 48px;}
    #cbody{border-radius: 3px 10px 0px #444;}
</style>
<div id="chat">
<div class="bt" onclick="toggle()" ></div>
<p id="cbody" style="display:none;">
    <iframe height="350" frameborder="0" width="300" src="http://talkgadget.google.com/talkgadget/client?fid=gtalk0&amp;relay=http%3A%2F%2Fwww.google.com%2Fig%2Fifpc_relay"></iframe>
</p>
</div>
<script>
    var $_ = function(x){return document.getElementById(x);}
   
    function toggle(){
    var ck = $_("cbody").style.display;
        if(ck != "none"){
            $_("cbody").style.display = "none";
        }
        if(ck != "block"){
            $_("cbody").style.display = "block";
        }
    }
</script>