Make base url relative in magento

app/code/local/Maglife/Core/etc/config.xml

<?xml version="1.0"?>
<config>
    <global>
        <models>
            <core>
                <rewrite>
                    <store>Maglife_Core_Model_Store</store>
                </rewrite>
            </core>
        </models>
    </global>
</config>

app/code/local/Maglife/Core/Model/Store.php 

<?php

class Maglife_Core_Model_Store extends Mage_Core_Model_Store
{

    protected function _processConfigValue($fullPath, $path, $node)
    {
        if (isset($this->_configCache[$path])) {
            return $this->_configCache[$path];
        }

        if ($node->hasChildren()) {
            $aValue = array();
            foreach ($node->children() as $k => $v) {
                $aValue[$k] = $this->_processConfigValue($fullPath . '/' . $k, $path . '/' . $k, $v);
            }
            $this->_configCache[$path] = $aValue;
            return $aValue;
        }

        $sValue = (string) $node;
        if (!empty($node['backend_model']) && !empty($sValue)) {
            $backend = Mage::getModel((string) $node['backend_model']);
            $backend->setPath($path)->setValue($sValue)->afterLoad();
            $sValue = $backend->getValue();
        }

        if (is_string($sValue) && strpos($sValue, '{{') !== false) {
            if (strpos($sValue, '{{unsecure_base_url}}') !== false) {
                $unsecureBaseUrl = $this->getConfig(self::XML_PATH_UNSECURE_BASE_URL);
                $sValue = str_replace('{{unsecure_base_url}}', $unsecureBaseUrl, $sValue);
            } elseif (strpos($sValue, '{{secure_base_url}}') !== false) {
                $secureBaseUrl = $this->getConfig(self::XML_PATH_SECURE_BASE_URL);
                $sValue = str_replace('{{secure_base_url}}', $secureBaseUrl, $sValue);
            } elseif (strpos($sValue, '{{base_url}}') !== false) {
                $sValue = Mage::getConfig()->substDistroServerVars($sValue);
            }
        }

        if(in_array($path,array('web/unsecure/base_url','web/secure/base_url','{{unsecure_base_url}}','{{secure_base_url}}'))){

        $sValue = $_SERVER[HTTP_REFERER].str_replace($_SERVER[HTTP_REFERER],'',$sValue);

        }
        $this->_configCache[$path] = $sValue;

        return $sValue;
    }

}

?>