Need help/ Centering Banner!

[Aclikyano]

I have put <center></center> where I thought it would work but it still is not center, please tell me where to place them.
here is the current header template:

<div class="above_body"> <!-- closing tag is in template navbar -->
<div id="header" class="floatcontainer doc_header">
    {vb:raw ad_location.ad_header_logo}

    <br><center>

<div><a name="top" href="{vb:raw vboptions.forumhome}.php{vb:raw session.sessionurl_q}" class="logo-image"><img src="{vb:stylevar titleimage}" alt="{vb:rawphrase x_powered_by_vbulletin, {vb:raw vboptions.bbtitle}}" /></a></div></center>
    <div id="toplinks" class="toplinks">
        <vb:if condition="$show['member']">
            <ul class="isuser">
                <li><a href="login.php?{vb:raw session.sessionurl}do=logout&amp;logouthash={vb:raw bbuserinfo.logouthash}" onclick="return log_out('{vb:rawphrase sure_you_want_to_log_out}')">{vb:rawphrase log_out}</a></li>
                <vb:if condition="$show['registerbutton']">
                <li><a href="register.php{vb:raw session.sessionurl_q}" rel="nofollow">{vb:rawphrase register}</a></li>
                </vb:if>                
                <li><a href="usercp.php{vb:raw session.sessionurl_q}">{vb:rawphrase control_panel}</a></li>
                <li><a href="{vb:link member, {vb:raw bbuserinfo}}">{vb:rawphrase your_profile}</a></li>
                <vb:if condition="$notifications_total">
                <li class="popupmenu notifications" id="notifications">
                    <a class="popupctrl" href="usercp.php{vb:raw session.sessionurl_q}">{vb:rawphrase your_notifications}: <span class="notifications-number"><strong>{vb:raw notifications_total}</strong></span></a>
                    <ul class="popupbody popuphover">
                        {vb:raw notifications_menubits}
                    </ul>
                </li>
                <vb:else />
                <li class="popupmenu nonotifications" id="nonotifications">
                    <a class="popupctrl" href="usercp.php{vb:raw session.sessionurl_q}">{vb:rawphrase your_notifications}</a>
                    <div class="popupbody popuphover">
                        <p>{vb:rawphrase no_new_messages}</p>
                        <p><a href="private.php{vb:raw session.sessionurl_q}">{vb:rawphrase inbox}</a></p>
                    </div>
                </li>
                </vb:if>
                <li class="welcomelink">{vb:rawphrase welcome_x_link_y, {vb:raw bbuserinfo.musername}, {vb:link member, {vb:raw bbuserinfo}}}</li>
            </ul>
            <vb:comment><p>{vb:rawphrase last_visited_x_at_y, {vb:raw pmbox.lastvisitdate}, {vb:raw pmbox.lastvisittime}}</p></vb:comment>
        <vb:else />
            <ul class="nouser">
            <vb:if condition="$show['registerbutton']">
                <li><a href="register.php{vb:raw session.sessionurl_q}" rel="nofollow">{vb:rawphrase register}</a></li>
            </vb:if>            
                <li><a rel="help" href="faq.php{vb:raw session.sessionurl_q}">{vb:rawphrase help}</a></li>
                <li>
            <script type="text/javascript" src="clientscript/vbulletin_md5.js?v={vb:raw vboptions.simpleversion}"></script>
            <form action="login.php?{vb:raw session.sessionurl}do=login" method="post" onsubmit="md5hash(vb_login_password, vb_login_md5password, vb_login_md5password_utf, {vb:raw show.nopasswordempty})">
                <fieldset id="logindetails" class="logindetails">
                    <div>
                        <div>
                    <input type="text" class="textbox default-value" name="vb_login_username" id="navbar_username" size="10" accesskey="u" tabindex="101" value="<vb:if condition="$username">{vb:raw username}<vb:else />{vb:rawphrase username}</vb:if>" onfocus="if (this.value == '<vb:if condition="$username">{vb:raw username}<vb:else />{vb:rawphrase username}</vb:if>'){this.value=''; this.style.color='black';}" onblur="if (this.value == '') {this.value='<vb:if condition="$username">{vb:raw username}<vb:else />{vb:rawphrase username}</vb:if>'; this.style.color='#828282';}"/>
                    <input type="password" class="textbox default-value" tabindex="102" name="vb_login_password" id="navbar_password" size="10" onfocus="this.style.color='black';" />
                    <input type="submit" class="loginbutton" tabindex="104" value="{vb:rawphrase log_in}" title="{vb:rawphrase enter_username_to_login_or_register}" accesskey="s" />
                        </div>
                    </div>
                </fieldset>
                <div id="remember" class="remember">
                    <label for="cb_cookieuser_navbar"><input type="checkbox" name="cookieuser" value="1" id="cb_cookieuser_navbar" class="cb_cookieuser_navbar" accesskey="c" tabindex="103" /> {vb:rawphrase remember_me}</label>
                </div>
            
                <input type="hidden" name="s" value="{vb:raw session.sessionhash}" />
                <input type="hidden" name="securitytoken" value="{vb:raw bbuserinfo.securitytoken}" />
                <input type="hidden" name="do" value="login" />
                <input type="hidden" name="vb_login_md5password" />
                <input type="hidden" name="vb_login_md5password_utf" />
            </form>    
                </li>
            </ul>
        </vb:if>
    </div>
    <div class="ad_global_header">
        {vb:raw ad_location.global_header1}
        {vb:raw ad_location.global_header2}
    </div>
    <hr />
    {vb:raw ad_location.ad_header_end}
</div>