This tutorial is extremely simple.

[php]<?php
$query = mysql_query("SELECT * table_name WHERE id = '1' ORDER BY RAND()"); 
//or a less specific version
$query = mysql_query("SELECT * FROM table_name ORDER BY RAND()");
?>[/php]

Explanation:

It's pretty much self explanatory. The mysql function RAND() selects rows at random. Also you might want to include a limit statement. 

And thats it!