Implode? Explode?

Hi all, I'm trying to fetch similar things - in this case, rows which share a series ID no - and bring them into an array and display them grouped by what makes them similar (in this case, series id). I looked at implode and explode which seem wrong for this - the only separator I can see is that they're each in a table cell. The result of my query returns something like:

art_id   series_id     art_title            series_name
2 	1 	       Weddings 2004        Summer Special
4 	1 	       Summer In The City   Summer Special
5       2              Bags of NY           Op-Art
7       2              Dogs of NY           Op-Art

I'd like to create a list of links to each art_id grouped together as series, href code obviously not complete but demonstrative: <p>Summer Special<br /> <a href='2'>Weddings 2004</a> | <a href='4'>Summer In The City</p> <p>Op-Art<br /> <a href='5'>Bags of NY</a> | <a href='7'>Dogs of NY</p> ? Thanks in advance, Jack