[StGaensler]

Originally Posted by GenSec

It works. Thank you!

But is it a way to change table border style?

Yes, that is possible through simple CSS:

/* format vBCode table */
table.stg_table {border:1px #0FF solid;}
table.stg_table thead tr {background:#000}
table.stg_table thead th {background:#FFF}
table.stg_table .alt1 {background:#F00;}
table.stg_table .alt2 {background:#0F0;}
table.stg_table td {border:1px #00F solid;}

I think you want to have the second line.
Put it into your css-definitions of your style.