Messages

#publicidad-video{
   position: absolute;
   z-index: 1;
   width: 300px;
   height: 250px;
   margin: 20px 0px 0px 160px;
}

.jbtn {
background: #A90000;
color: #fff;
border: 1px solid #fff;
border-radius: 3px;
padding: 2px;
cursor: pointer;
}

.jbtn:hover {
background: #F00;
}

.asdsdfg {
   float: left;
   height: 250px;
   width: 300px;
   position: fixed;
   z-index: 99999;
}

<div class="asdsdfg"><div>         
   <div id="publicidad-video">
   <iframe frameborder="0" marginwidth="0" marginheight="0" scrolling="no" width="300" height="250" SRC="http://ad.adnetwork.net/st?ad_type=iframe&ad_size=300x250&section=4044523" ></iframe>
   <br>
   <div style="float: left; left: 180px; position: relative; top: -210px; z-index: 9999;">
   <span class="jbtn" onmouseover="jQuery(this).hide('fast');jQuery('#asd1').show('slow')">cerrar</span>
   </div>
   <div id="asd1" style="display: none; float: left; position: relative; top: -65px; z-index: 9999;">
   <span class="jbtn" onclick="jQuery(this).parent().parent().remove();">cerrar</span>
   </div>
   </div>   
</div></div>

$txt['limited_views_message'] = 'All guests are limited to %s page views per day.<br /> We now invite you to <a href="' . $scripturl . '?action=login">login</a> or <a href="' . $scripturl . '?action=register">register</a> to continue accessing the forum.';

Esa, siendo que ese es el mensaje que se muestra cuando hay un error

$txt['limited_views_message'] = '<img src="urlimagen" alt="altimage" />';