how to include the file with relative path?

[admin]

there is a file directory as this:

magento\app\design\frontend\default\template\catalog\product\view.phtml

the another file directory as this:

magento\blog\wp-blog-header.php

now,if i want to in view.phtml include the wp-blog-header.php.how do i do?thank you.

include('../../../../../../../wordpress/wp-blog-header.php');