@arun
Plugin does not have capability to check if user is online or not.
If message is read or not is in database in table im_messages, column i_read
It's in variable $message (or $m) used in messages.php, you can get it like $m['i_read']

How to set up ?

I do not have code and itvrequire lot of testing to set it up properly.

user online plugin can be integrated in Instant Messenger Plugin?

@arun
If you have right code then yes, you should be checking last active time of user and compare with real time.

Add this code but showing offline  <?php if(function_exists('useronline_show_user_status')) {useronline_show_user_status();} ?>

working only item page

@arun
Check code of that function, it probably use osc_item_user_id(), you need to use ID of message user.

How to add user id ?

@arun
Modify that function. Are you sure what are you doing?

I am try but nothing

@arun
What you put there?

(osc_item_user_id()

This works only on the item page 


<?php if(function_exists('useronline_show_user_status')) {useronline_show_user_status();} ?>