Here are the required modifications (basically the same as Roland's but with line numbers of a fresh Snitz v3.4.04 install):
Find the following code in inc_func_common.asp (line 474):
fString = replace(fString, "[hr]", "<hr noshade size=""1"">", 1, -1, 1)
and add the following code below that line:
'## tables
fString = replace(fString, "[table]", "<table border=""1"" cellspacing=""0"" cellpadding=""0"">", 1, -1, 1)
fString = replace(fString, "[/table]", "</table>", 1, -1, 1)
fString = replace(fString, "[tr]", "<tr>", 1, -1, 1)
fString = replace(fString, "[/tr]", "</tr>", 1, -1, 1)
fString = replace(fString, "[td]", "<td>", 1, -1, 1)
fString = replace(fString, "[/td]", "</td>", 1, -1, 1)
'##
Now find the following code in inc_func_posting.asp (line 340):
fString = replace(fString, "</font id=""code""></pre id=""code"">","[/code]", 1, -1, 1)
and add the following code below that line:
'## new table creating codes
fString = replace(fString, "<table border=""1"" cellspacing=""0"" cellpadding=""0"">","[table]", 1, -1, 1)
fString = replace(fString, "</table>","[/table]", 1, -1, 1)
fString = replace(fString, "<tr>","[tr]", 1, -1, 1)
fString = replace(fString, "</tr>","[/tr]", 1, -1, 1)
fString = replace(fString, "<td>","[td]", 1, -1, 1)
fString = replace(fString, "</td>","[/td]", 1, -1, 1)
'##
That's all.
(make sure you backup your files before you make any modifications)