Only show the lockfolder icon

[Gstone]

forumdisplay_thread ->

Code:

<span class="thread_lock_{$thread['closed']}">{$prefix} {$thread['threadprefix']}<a href="{$thread['threadlink']}" class="{$inline_edit_class} {$new_class}" id="tid_{$inline_edit_tid}">{$thread['subject']}</a></span>

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where you see the span class, that is what you need to add (thread_lock_{$thread['closed']}).

in global.css ->

Code:

.thread_lock_1 { background: url(images/yourstyle/lock.png) no-repeat 0 0; }

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Then upload a lock image to your theme and make sure the directory above is correct.