[StGaensler]

Originally Posted by JonUrban

Is there a way to get it back to being centered?

Sorry for the late answer... Put something like .stg_table {margin: 0 auto;} to your additional CSS definitions.

Originally Posted by fernandose

is it possible for users to sort the columns themselves by clicking on the column header? Instead of auto sorting the columns?

As I said in the first post:
If you want to have live sortable columns (JavaScript): Download attached sorttable.js.txt rename it to sorttable.js and place it into the /clientscript/ folder of your vBulletin. Then go to AdminCP -> vBulletin Options -> BB Code [table] Settings -> Enabled Features Of This BB Code and enable sortable
Note: Including the file on the webpages where it is necessary is done by my product. So if sortable is disabled, it won't be included automatically.

Originally Posted by cellow

I want to use the css option, but it doesn't works.
Maybe i make a misstake.
Here is, how i go for it:

[...]

Did i make i misstake?

Yes, but only a very small. With point 1. and 3. you have to use myclass instead of stg_table_myclass

Originally Posted by mr.Travel

Just open /includes/class_bbcode.php [...]
Simple for Wemasters like HTML

Yes I know that and I also linked to a product doing this. You should avoid file edits if you can archive the same with an Add-on.
Only some disadvantages of this solution: If you make any mistake with nesting or count of the elements, you have a broken (invalid) table. You can't define maximum dimensions of the table, or sort it in any way (live or for posting).