Hướng dẫn Hiện chatbox mọi trang cho mybb

Code:
<!----Chat box---->
 <style type="text/css">
 #gb{
 position:fixed;
 top:250px;
 z-index:+1000;
 }
 * html #gb{position:relative;}
 
 .gbtab{
 height:150px;
 width:30px;
 float:left;
 cursor:pointer;
 background:url('http://farm3.static.flickr.com/2636/3935353655_32c6d2bb30_o.png') no-repeat;
 }
 .gbcontent{
 float:left;
 border:2px solid #990000;
 background:#F5F5F5;
 padding:10px;
 }
 </style>
 
 <script type="text/javascript">
 function showHideGB(){
 var gb = document.getElementById("gb");
 var w = gb.offsetWidth;
 gb.opened ? moveGB(0, 30-w) : moveGB(20-w, 0);
 gb.opened = !gb.opened;
 }
 function moveGB(x0, xf){
 var gb = document.getElementById("gb");
 var dx = Math.abs(x0-xf) > 10 ? 5 : 1;
 var dir = xf>x0 ? 1 : -1;
 var x = x0 + dx * dir;
 gb.style.right = x.toString() + "px";
 if(x0!=xf){setTimeout("moveGB("+x+", "+xf+")", 10);}
 }
 </script>
 
 <div id="gb">
 
 <div class="gbtab" onclick="showHideGB()"> </div>
 
 <div class="gbcontent">
 
 {$changfcb}
 
 <div style="text-align:right">
 <a href="javascript:showHideGB()">
 [Hide]
 </a>
 </div>
 
 </div>
 
 </div>
 
 <script type="text/javascript">
 var gb = document.getElementById("gb");
 gb.style.right = (30-gb.offsetWidth).toString() + "px";
 </script>