This page gives an example of how to do routing on google by inserting the strings 'to:' and 'from:' into your hyperlink queries. In general, a query of the form http://maps.google.com/?q=from:+address1+to:+address2 will give you the route from address1 to address2. (Near as I can tell, it is equivalent to http://maps.google.com/maps?saddr=address1&daddr=address2, so you can choose whichever suits your taste more.)