[Plugin: upPrev] Customizable static popup content on selected posts

You have three ways to do it.

1. Add custom post “my client static content” and setup upPrev to display only this custom post type without ‘Match post type’.

2. use action ‘iworks_upprev_box_before’ to add content before item(s) or use action ‘iworks_upprev_box_after’ to add content after item(s)

3. use filter ‘iworks_upprev_box_item’ to modify any item (trunk/3.0 version), see example

add_filter( 'iworks_upprev_box_item', 'item_eaeaeaeae' );

function item_eaeaeaeae( $item )
{
    return 'item:'.$item;
}

Thanks buddy!
I was able to get the expected result from your suggestions.