كيف اضع هذا في المنتصف

<if condition="$show[guest]">
    <style type="text/css">
    #topbar{
    position:absolute;
    border: 4px solid black;
    padding: 4px;
    background-color: white;
    width: 240px;
    visibility: hidden;
    z-index: 0;
    }
    </style>
    <script type="text/javascript">
    var persistclose=0 //set to 0 or 1. 1 means once the bar is manually closed, it will remain closed for browser session
    var startX = 30 //set x offset of bar in pixels
    var startY = 4 //set y offset of bar in pixels
    var verticalpos="fromtop" //enter "fromtop" or "frombottom"
    function iecompattest(){
    return (document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body
    }
    function get_cookie(Name) {
    var search = Name + "="
    var returnvalue = "";
    if (document.cookie.length > 0) {
    offset = document.cookie.indexOf(search)
    if (offset != -1) {
    offset += search.length
    end = document.cookie.indexOf(";", offset);
    if (end == -1) end = document.cookie.length;
    returnvalue=unescape(document.cookie.substring(offset, end))
    }
    }
    return returnvalue;
    }
    function closebar(){
    if (persistclose)
    document.cookie="remainclosed=1"
    document.getElementById("topbar").style.visibility="hidden"
    }
    function staticbar(){
    barheight=document.getElementById("topbar").offsetHeight
    var ns = (navigator.appName.indexOf("Netscape") != -1) || window.opera;
    var d = document;
    function ml(id){
    var el=d.getElementById(id);
    if (!persistclose || persistclose && get_cookie("remainclosed")=="")
    el.style.visibility="visible"
    if(d.layers)el.style=el;
    el.sP=function(x,y){this.style.left=x+"px";this.style.top=y+"px";};
    el.x = startX;
    if (verticalpos=="fromtop")
    el.y = startY;
    else{
    el.y = ns ? pageYOffset + innerHeight : iecompattest().scrollTop + iecompattest().clientHeight;
    el.y -= startY;
    }
    return el;
    }
    window.stayTopLeft=function(){
    if (verticalpos=="fromtop"){
    var pY = ns ? pageYOffset : iecompattest().scrollTop;
    ftlObj.y += (pY + startY - ftlObj.y)/8;
    }
    else{
    var pY = ns ? pageYOffset + innerHeight - barheight: iecompattest().scrollTop + iecompattest().clientHeight - barheight;
    ftlObj.y += (pY - startY - ftlObj.y)/8;
    }
    ftlObj.sP(ftlObj.x, ftlObj.y);
    setTimeout("stayTopLeft()", 10);
    }
    ftlObj = ml("topbar");
    stayTopLeft();
    }
    if (window.addEventListener)
    window.addEventListener("load", staticbar, false)
    else if (window.attachEvent)
    window.attachEvent("onload", staticbar)
    else if (document.getElementById)
    window.onload=staticbar
    </script><div id="topbar" style="border:5px ridge #808080; ">
    <p align="center"><div style="text-align: center;"><br><font size="4"><span style="font-weight: bold; font-family: Palatino Linotype;">هذه الرسالة تفيد أنك <span style="color: SeaGreen;">غير مسجل</span> .</span></font><br><br><font style="color: Red;" size="4"><span style="font-weight: bold; font-family: Palatino Linotype;">و يسعدنا كثيرا انضمامك لنا ...</span></font><br></div> <p align="center">

    <a href="" onClick="closebar(); return false"><img src="http://i67.servimg.com/u/f67/13/57/76/76/close10.gif" border="0" /></a>
    <b><font face="Arial"><font color="#808080" style="font-size: 14pt">للتسجيل اضغط</font><span style="font-size: 14pt">
    </span> <a href="/profile.forum?mode=register">
    <font color="#FF9900" style="font-size: 14pt">هـنـا</font></a></font></b></div>
    </if>