<?php
    $_cat  =   Mage::getModel('catalog/layer')->getCurrentCategory()->getId(); 
    $_productCollection=$this->getLoadedProductCollection();
    $_helper = $this->helper('catalog/output');
?>


<?php    $cat = Mage::getModel('catalog/category')->load($_cat);
        $_categories = $cat->getChildrenCategories(); ?>
        <?php foreach ($_categories as $_category): ?>
        <?php $subcatid =  $_category->getId() ?>
        <a href="<?php echo $_category->getUrl() ?>" title="<?php echo $_category->getName() ?>"><?php echo $_category->getName() ?></a>
        <?php  //$productCollection = Mage::getResourceModel('catalog/product_collection')
                          //->addCategoryFilter(4);?>
        <?php endforeach; ?> 


<?php if(!$_productCollection->count()): ?>
<p class="note-msg"><?php echo $this->__('There are no products matching the selection.') ?></p>
<?php else: ?>
<div class="category-products">
    <?php //echo $this->getToolbarHtml() ?>
    <?php if($this->getMode()=='grid'): ?>
    <?php $_collectionSize = $_productCollection->count() ?>
    <?php $_columnCount = $this->getColumnCount(); ?>
    <ul>
    <?php foreach ($_productCollection as $_product): ?>
        <?php if($_product->isConfigurable()) :?>
            <h2 class="product-name"><a href="<?php echo $_product->getProductUrl() ?>" title="<?php echo $this->stripTags($_product->getName(), null, true) ?>"><?php echo $_helper->productAttribute($_product, $_product->getName(), 'name') ?></a></h2>
        <li style="float:left;">

            <?php /**************** To Display simple products associated to configurable products ********************/?>

            <?php $conf = Mage::getModel('catalog/product_type_configurable')->setProduct($_product);
            $col = $conf->getUsedProductCollection()->addAttributeToSelect('*')->addFilterByRequiredOptions();?>
            <ul>
                <?php foreach($col as $simple_product) : ?>
                <li style="float:left;margin-right:20px; border:1px solid #ddd;">
                    <?php   $product_id = $simple_product->getId();
                    $obj = Mage::getModel('catalog/product');
                    $_products = $obj->load($product_id); // Enter your Product Id in $product_id
                    echo "<strong><a href='".$_products->getProductUrl()."'>".$_products->getName()."</strong></a>";
                    $_products->setData('tier_price',null);
                    $_tierPrices = $this->getTierPrices($_products);?>
                        <ul id="price table">
                            <?php foreach ($_tierPrices as $tier): ?>
                            <li>
                            <?php echo $tier['formated_price'];?>
                            <?php echo $tier['price_qty'];?>
                            </li>
                            <?php endforeach ; ?>
                        </ul>
                        <a href="<?php echo $this->getAddToCartUrl($_product) ?>">Order</a>
                </li>
                <?php endforeach; ?>
            </ul>
            <?php /**************** To Display simple products associated to configurable products ********************/?>

        </li>
        <?php endif; ?>
        <?php endforeach; ?>
    </ul>
        <script type="text/javascript">decorateGeneric($$('ul.products-grid'), ['odd','even','first','last'])</script>
    <?php endif; ?>
</div>
<?php endif; ?>