Hola, vengo con un pequeño problema, no puedo activar el plugin "FancyBox (1.0)", quisiera saber si alguien me puede ayudar.

Plantillas:

header_welcomeblock_guest:

<script type="text/javascript">
<!--
	lang.username = "{$lang->login_username}";
	lang.password = "{$lang->login_password}";
	lang.login = "{$lang->login}";
	lang.lost_password = " &mdash; <a href=\"{$mybb->settings['bburl']}/member.php?action=lostpw\">{$lang->lost_password}<\/a>";
	lang.register_url = " &mdash; <a href=\"{$mybb->settings['bburl']}/member.php?action=register\">{$lang->welcome_register}<\/a>";
	lang.remember_me = "{$lang->remember_me}";
// -->
</script>
<li><a id="userloginmenu" href="javascript:void(0);">{$lang->welcome_login}</a></li>
<li><a href="{$mybb->settings['bburl']}/member.php?action=register">{$lang->welcome_register}</a></li>
<li style="float: right;">{$lang->welcome_current_time}</li>

header:

<div id="container">
		<a name="top" id="top"></a>
		<div id="panel">
			<div class="wrap"><ul>{$welcomeblock}</ul></div>
			<script>
				$('panel_usermenu').observe('click', function() {
					this.next('div').toggle();
				});
			</script>
		</div>
		<div id="popupLogin" style="display: none;">  
            <a id="popupLoginClose" href="javascript:void(0);">x</a> 
            <h3>{$lang->login}</h3>
            <div class="box">
            	<form id="login_form"  action="member.php" method="post">
            	<fieldset>
                <ul>
                    <li>
                        <label class="loginlabel" for="username">{$lang->username}</label>
                        <div class="loginfield"><input id="username" size="30" class="input_text" type="text" name="username" /></div>
                    </li>
                    <li>
                    	<label class="loginlabel" for="password">{$lang->password}</label>
                        <div class="loginfield"><input id="password" size="30" class="input_text" type="password" name="password" /><br/>
                        <a href="member.php?action=lostpw">{$lang->lostpw_note}</a></div>
                    </li>
                    <li>
                    	<input type="checkbox" value="1" name="remember" checked="checked" value="yes" id="remember" /> <label for="remember">{$lang->remember_me}</label>{$captcha}
                    </li>
                    <li>
                    	<input id="login_submit" type="submit" value="{$lang->login}" />
						<input type="hidden" name="action" value="do_login" />
						<input type="hidden" name="url" value="{$redirect_url}" />
                    </li>
                </ul>
                </fieldset>
                </form>
            </div>
        </div>  
        <div id="backgroundPopup" style="display: none;"></div>
		<script>
			$('userloginmenu').observe('click', function() {
				$('popupLogin').toggle();
				$('backgroundPopup').toggle();
			});
			$('popupLoginClose').observe('click', function() {
				$('popupLogin').toggle();
				$('backgroundPopup').toggle();
			});
			$('backgroundPopup').observe('click', function() {
				$('popupLogin').toggle();
				$('backgroundPopup').toggle();
			});
		</script>
		<div id="header">
			<div class="logo">
				<a href="{$mybb->settings['bburl']}/index.php"><img src="{$theme['logo']}" alt="{$mybb->settings['bbname']}" title="{$mybb->settings['bbname']}" /></a>
				<div class="searchbox">
					<form method="post" action="{$mybb->settings['bburl']}/search.php">
						<input type="hidden" name="action" value="do_search">
						<input type="hidden" name="postthread" value="1">
						<input type="hidden" name="forums" value="all">
						<input type="hidden" name="showresults" value="threads">
						<input id="b-query" onfocus="if (this.value == 'Search...') {this.value = '';}" onblur="if (this.value == '') {this.value = 'Search...';}" type="text" class="textbox" name="keywords" value="Search...">
						<input id="b-searchbtn" type="submit" class="button" value="Go">
					</form>
				</div>
			</div>
		</div>
		<hr class="hidden" />
		<br class="clear" />
		<div id="content">
			{$pm_notice}
			{$bannedwarning}
			{$bbclosedwarning}
			{$unreadreports}
			{$pending_joinrequests}
			<div class="menu">
				<ul>
					<li><a href="{$mybb->settings['homeurl']}"><span>{$mybb->settings['homename']}</span></a></li>
					<li><a href="{$mybb->settings['bburl']}/search.php"><span>{$lang->toplinks_search}</span></a></li>
					<li><a href="{$mybb->settings['bburl']}/memberlist.php"><span>{$lang->toplinks_memberlist}</span></a></li>
					<li><a href="{$mybb->settings['bburl']}/calendar.php"><span>{$lang->toplinks_calendar}</span></a></li>
					<li><a href="{$mybb->settings['bburl']}/misc.php?action=help"><span>{$lang->toplinks_help}</span></a></li>
				</ul>
			</div>
			<navigation>
			<br />

Espero respuestas, cualquier cosa pidan.

P/D: On. Turn FancyBox on and off. "Sí".