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app/design/frontend/default/Your_Theme/template/catalog/category/view.phtml

comment  div containing page-tite and  category-title


<div class="page-title category-title">
    <?php if($this->IsRssCatalogEnable() && $this->IsTopCategory()): ?>
        <a href="<?php echo $this->getRssLink() ?>" class="link-rss"><?php echo $this->__('Subscribe to RSS Feed') ?></a>
    <?php endif; ?>
    <h1><?php echo $_helper->categoryAttribute($_category, $_category->getName(), 'name') ?></h1>
</div>