<reference name=”left”>

<block type=”cms/block” name=”blockName” before=”-” >

<action method=”setBlockId”><block_id>block_identifier</block_id></action>

</block>

</reference>

before=”-” – It lists as the first block
after=”-“- It lists as the last block
before=”block_name” – To load before a block
after=”block_name”  – To load after a block

<?php

echo Mage::getSingleton(‘customer/session’)->getCustomerGroupId();

?>

<?php

if($this->helper('customer')->isLoggedIn())

echo “logged in”;

?>

if(Mage::helper(‘core’)->escapeHtml($product->getTypeId())==”grouped”)
echo “Grouped Product”;