Add Main Category Images to Homepage

Put this code in your CMS homepage

{{block type="catalog/product_list" template="catalog/image.phtml"}}

Create a new file under app/design/frontend/default/<your theme="">/template/catalog/image.phtml

<?php
    //to get category id & name
    $helper     = Mage::helper('catalog/category');
        $collection = $helper->getStoreCategories('position', true, false);
       $array      = $helper->getStoreCategories('name', false, false);
    $categoryCount    =    0;
    //    echo "<pre>";print_r(get_class_methods($collection));
    echo "<table width='750' cellpadding='0' cellspacing='0' border='0' align='center'>";
    foreach ($collection as $cat):
    $Mcategory = Mage::getModel('catalog/category')->load($cat->getEntityId());

    if(($Mcategory->getLevel() == 2) && ($Mcategory->getImageUrl()))
    {
        if($categoryCount    %    4    ==    0)
        {
            echo "<tr>";
        }
   
        $categoryCount++;
    echo "<td width='245'>";
               
                  echo       "<div>
                            <a href=". $cat->getUrl() ." ><img src=".$Mcategory->getImageUrl()." align='middle' width='125px' height='105px' /></a>
                        </div>
                        <p><a style='color:#5C5C5C; font-weight:bold; text-decoration:underline; font-size:13px;' href=".$cat->getUrl()." >". $cat->getName()."</a></p>
                        <td>";
   
    if($categoryCount    %    4    ==    0)
    {
        echo "</tr>";
    }}
    endforeach;
    echo "</table>";
?>