Messaging System with PHP/MySQL -

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hi i'm trying make messaging system php , mysql.

the mysql table simple: id sender receiver text timestamp

i'm trying make messaging facebook/twitter list in 'conversations' , last message in conversation viewed.

this have atm:

(select * messages receiver = 13 or sender = 13 group receiver,sender order id asc) order id asc 

select messages.* messages, (select max(id) lastid messages  receiver = 13 or sender = 13  group concat(least(receiver,sender),'.',greatest(receiver,sender))) conversations id = conversations.lastid order timestamp desc

what need unique conversation id between chat-partners. i've simulated subquery, hope helps


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