[Elenna]

From my post in the Highslide thread:
https://vborg.vbsupport.ru/showpost....&postcount=392

You can add an additional [img] tag in BBCode, and it will get parsed in place of your regular img code.

Once you have Highslide installed and working for Attachments, here is what I did (not pretty, very rudamentary, but working!):

In AdminCP>Custom BB Codes> BBCode Manager, scroll to bottom and click Add New.

Title: Image
Tag: img
Replacement:

<a href="{param}" class="highslide" onclick="return hs.expand(this,{slideshowGroup:'$post[postid]'})" target="_blank"><img src="{param}" width="100"></a>

Example: (Whatever you want)
Description: (Whatever you want)

Note: I added another BBCode called imgsmall which does NOT use highslide. I use this for instructions, etc, where the image itself is smaller than 100px, so it would make no sense to have a thumbnail for it.
I use the following replacement code:

<img src={param} border=0>