Yo que vos revisaría un poco el código. Mirá:
Código:
<div id="art-page-background-glare">
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<div class="art-sheet">
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<div class="art-header-png"><a href="http://localhost/comunidad/wordpress"><img align="top" src="http://localhost/comunidad/wordpress/wp-content/themes/tema3/images/header.png"></a></div>
<div class="art-header-jpeg"><a href="http://localhost/comunidad/wordpress"><img align="top" src="http://localhost/comunidad/wordpress/wp-content/themes/tema3/images/header.jpg" width="884px;" height="165;"></a></div>
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<a href="http://www.lasbuganvillas.org/comunidad/">Buganvillas</a></h1>
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<li class="active" ><a class="active" href="http://www.lasbuganvillas.org/comunidad" title="Inicio"><span class='l'></span><span class='r'></span><span class='t'>Inicio</span></a></li>
<li><a href="http://www.lasbuganvillas.org/comunidad/noticias/" title="Noticias"><span class='l'></span><span class='r'></span><span class='t'>Noticias</span></a></li>
<li><a href="http://www.lasbuganvillas.org/comunidad/tablon-de-anuncios/" title="Anuncios"><span class='l'></span><span class='r'></span><span class='t'>Anuncios</span></a></li>
<li><a href="http://www.lasbuganvillas.org/comunidad/vecinos/" title="Vecinos"><span class='l'></span><span class='r'></span><span class='t'>Vecinos</span></a></li>
<li><a href="http://www.lasbuganvillas.org/comunidad/forumpress/" title="Foro"><span class='l'></span><span class='r'></span><span class='t'>Foro</span></a></li>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
Qué hace allí todo ese código html antes de DOCTYPE?