Redirect user after login

Thank you Guys.

below is the observer function that worked for me

 public function setRedirectOnLogin(){
        $session = Mage::getSingleton('customer/session');
        if (strpos(Mage::helper('core/http')->getHttpReferer(), 'checkout') === false)
            $session->setAfterAuthUrl(Mage::getBaseUrl());  
        else             
            $session->setAfterAuthUrl(Mage::helper('core/http')->getHttpReferer());

        $session->setBeforeAuthUrl('');
    }

You should first change your customer configuration:

Then use a referrer param on the form. For instance

<form action="<?php
    echo $this->getUrl(
        'customer/account/loginPost',
        array(
            'referer' =>
            // Encode the base url, or whatever URL we want to go to
            Mage::helper('core')->urlEncode(Mage::getBaseUrl())
        )
    ) ?>" method="post">

try this

<?php Mage::getSingleton('customer/session')->setBeforeAuthUrl($this->getBaseUrl()); ?>