Procure  por ]]></b:skin>  e cole o codigo acima :


#gb { position:fixed; top:150px; z-index:+1000; left:-610px; } * html #gb { position:relative; } .gbtab { height:161px; width:47px; float:right; cursor:pointer; background:url('http://i.imgur.com/HWwgK.png') no-repeat; margin-top:20px; } .gbcontent { float:left; border:2px solid #8c00c1; background:#fff; opacity:0.80; -moz-opacity: 0.80; filter: alpha(opacity=80); -webkit-border-radius: 20px; border-radius: 20px; -khtml-border-radius: 20px; padding:8px; }

Agora procure por body e cole esse codigo acima : 

<script type='text/javascript'> function showHideGB(){ var gb = document.getElementById(&quot;gb&quot;); var w = gb.offsetWidth; gb.opened ? moveGB(0, 47-w) : moveGB(20-w, 0); gb.opened = !gb.opened; } function moveGB(x0, xf){ var gb = document.getElementById(&quot;gb&quot;); var dx = Math.abs(x0-xf) &gt; 10 ? 5 : 1; var dir = xf&gt;x0 ? 1 : -1; var x = x0 + dx * dir; gb.style.left = x.toString() + &quot;px&quot;; if(x0!=xf){setTimeout(&quot;moveGB(&quot;+x+&quot;, &quot;+xf+&quot;)&quot;, 10);} } </script> <div id='gb'> <div class='gbtab' onclick='showHideGB()'> </div> <div class='gbcontent'> <div style='line-height:0;background-position:center;width:590px;height:310px;'> <embed align='middle' allowscriptaccess='sameDomain' flashvars='id=163040885' height='310' name='chat' pluginspage='http://xat.com/update_flash.shtml' quality='high' src='http://www.xatech.com/web_gear/chat/chat.swf' type='application/x-shockwave-flash' width='590' wmode='transparent'/> </div> </div> </div>

O que esta em vermelho e o id do xat e so trocar pelo seu !