The sample code you are after are in files like:
Line 318 in sales/inquiry/sales_orders_view.php
and
Line 244 in sales/inquiry/customer_inquiry.php

The colors are provided as arguments to the set_marker() function as seen in lines 390-398 of includes/db_pager.inc:

    //    Set check function to mark some rows.
    //    
    function set_marker($func, $notice='', $markercl='overduebg', $msgclass='overduefg' )
    {
        $this->marker = $func;
        $this->marker_txt = $notice;
        $this->marker_class = $markercl;
        $this->notice_class = $msgclass;
    }

The color values of overduebg (background color) and overduefg (text color) for marking purposes are available in the various theme css like in lines 320-326 of themes/default/default.css :

.overduebg {
    background-color: #dd7777;
}

.overduefg {
    color: #dd7777;
}

? am saying i have use all include file ..and if i am using only one set_maker with one function then its working properly , but iam using 2 set_maker which i have mention above then only below one is working ..

What page in FA are you using as the basis for your page?

Unless we know the context and what includes are available at the point of usage, how can we help you?

Thanks for reply , dude thats my own code page , what i am looking is :

$table->set_marker('check_overdue', _("Marked area are not completed / Over Date."));
$table->set_marker('testaa', _("Markfed orders are overdue."));
$table->width = "95%";

but only One function testaa  is working .. cant i have multiple set maker ?

Can i have multiple set_marker - That's Overdue Color with different function ?.

I want a page where i have 2 function one is overdue as per date required and second one is as per User  with different color ( one is red and second one is green ).

Admin please let me know .

Thanks
Tester