Joomla - Random Article Order in Blog Mode

Desc: How to show randomized Articles in Category Blog View in Joomla 1.7
Date: 20120120

Modification 1: 
file: /components/com_content/helpers/query.php

search for:
         case 'front' :
            $orderby = 'f.ordering';
            break;
replace with:
         case 'front' :
            $orderby = 'f.ordering';
            break;
         case 'random' :
            $orderby = 'rand()';
            break;


Modification 2: 
file: /components/com_content/views/section/tmpl/blog.xml

search for:
            <option value="order">Ordering</option>
replace with:
            <option value="order">Ordering</option>
            <option value="random">RANDOM</option>