Add new field in registration page magento 1.8.1

I have done this with the following steps.
Suppose if you want to add "occupation" after email 
Open template/customer/form/register.phtml and template/customer/form/edit.phtml
 <li>
        <div class="input-box">
            <label for="email_address"><?php echo $this->__('Email Address') ?> <span class="required">*</span></label><br/>
            <input type="text" name="email" id="email_address" value="<?php echo $this->htmlEscape($this->getFormData()->getEmail()) ?>" title="<?php echo $this->__('Email Address') ?>" class="validate-email required-entry input-text" />
        </div>
        <div class="input-box">
            <label for="occupation"><?php echo $this->__('Occupation/Title') ?></label><br/>
            <input type="text" name="occupation" id="occupation" value="<?php echo $this->htmlEscape($this->getFormData()->getOccupation()) ?>" title="<?php echo $this->__('Occupation') ?>" class="input-text" />
        </div>
    </li>

Now open app\code\core\Mage\Customer\etc\config.xml
and add <occupation><create>1</create><update>1</update></occupation>
after <fieldsets><customer_dataflow> 

Now open app\code\core\Mage\Customer\Model\Resource\Setup.php
 find $entities = array(  and add the following code 
'occupation'               => array(
                        'type'               => 'varchar',
                        'label'              => 'Fax',
                        'input'              => 'text',
                        'required'           => false,
                        'sort_order'         => 130,
                        'validate_rules'     => 'a:2:{s:15:"max_text_length";i:255;s:15:"min_text_length";i:1;}',
                        'position'           => 130,
                    ), 
 
Now i insert some value in db

INSERT INTO  `eav_attribute` (

`attribute_id` ,

`entity_type_id` ,

`attribute_code` ,

`attribute_model` ,

`backend_model` ,

`backend_type` ,

`backend_table` ,

`frontend_model` ,

`frontend_input` ,

`frontend_label` ,

`frontend_class` ,

`source_model` ,

`is_required` ,

`is_user_defined` ,

`default_value` ,

`is_unique` ,

`note`

)

VALUES (

NULL ,  '1',  'school', NULL , NULL ,  'int', NULL , NULL ,  'select',  'School', NULL ,  'profile/entity_school',  '1',  '0',  '0',  '0',  ''

);

- See more at: http://www.excellencemagentoblog.com/customer-registration-fields-magento1-6#sthash.ubBrtvuS.dpuf

INSERT INTO  `eav_attribute` (

`attribute_id` ,

`entity_type_id` ,

`attribute_code` ,

`attribute_model` ,

`backend_model` ,

`backend_type` ,

`backend_table` ,

`frontend_model` ,

`frontend_input` ,

`frontend_label` ,

`frontend_class` ,

`source_model` ,

`is_required` ,

`is_user_defined` ,

`default_value` ,

`is_unique` ,

`note`

)

VALUES (

NULL ,  '1',  'school', NULL , NULL ,  'int', NULL , NULL ,  'select',  'School', NULL ,  'profile/entity_school',  '1',  '0',  '0',  '0',  ''

);

- See more at: http://www.excellencemagentoblog.com/customer-registration-fields-magento1-6#sthash.ubBrtvuS.dpuf

 INSERT INTO  `eav_attribute` (
`attribute_id` ,
`entity_type_id` ,
`attribute_code` ,
`attribute_model` ,
`backend_model` ,
`backend_type` ,
`backend_table` ,
`frontend_model` ,
`frontend_input` ,
`frontend_label` ,
`frontend_class` ,
`source_model` ,
`is_required` ,
`is_user_defined` ,
`default_value` ,
`is_unique` ,
`note`
)
VALUES (
NULL ,  '1',  'occupation', NULL , NULL ,  'int', NULL , NULL ,  'select',  'School', NULL ,  'profile/entity_school',  '1',  '0',  '0',  '0',  ''
);

INSERT INTO  `eav_entity_attribute` (
`entity_attribute_id` ,
`entity_type_id` ,
`attribute_set_id` ,
`attribute_group_id` ,
`attribute_id` ,
`sort_order`
)
VALUES (
NULL ,  '1',  '1',  '1',  '121',  '0'
);

INSERT INTO  `customer_eav_attribute` (
`attribute_id` ,
`is_visible` ,
`input_filter` ,
`multiline_count` ,
`validate_rules` ,
`is_system` ,
`sort_order` ,
`data_model`
)
VALUES (
'121',  '1', NULL ,  '1', NULL ,  '0',  '0', NULL
);

INSERT INTO `customer_eav_attribute_website` (
`attribute_id` ,
`website_id` ,
`is_visible` ,
`is_required` ,
`default_value` ,
`multiline_count`
)
VALUES (
'121',  '0',  '1',  '0', NULL , NULL
);

INSERT INTO  `customer_form_attribute` (
`form_code` ,
`attribute_id`
)
VALUES (
'adminhtml_customer',  '121'
), (
'checkout_register',  '121'
), (
'customer_account_create',  '121'
), (
'customer_account_edit',  '121'
)
;

Also go to the 
System→Configurations→Customers→Customer Configurations→Address Templates
and Add this code in the “Text” textarea:-

 

{{depend occupation}}{{var occupation}}{{/depend}}

Add this code in the “Html” textarea      

{{depend occupation}}{{var occupation}}<br />{{/depend}}

Add the below code in the “PDF” text area. 

{{depend occupation}}{{var occupation}}|{{/depend}}