If you want to get the base url of an admin, You can use one of the below code as your requirement.
<?php $route = '*/customer/index/'; Mage::helper('adminhtml')->getUrl($route); $this->getUrl($route); Mage::helper('adminhtml')->getUrl('*/customer/index/'); $params = array('id'=>1); Mage::helper('adminhtml')->getUrl($route, $params); $this->getUrl('adminhtml/system_config/edit', array('section'=>'web', 'store'=>$code)); $this->getUrl('adminhtml/customer/edit', array('id'=>1)); ?>