Hello from Russia!!!
I have to insert this code to change the width of one column of my table.

/* Using aoColumns */
$(document).ready(function() {
	$('#example').dataTable( {
		"aoColumns": [ 
			{ "sWidth": "20%" },
			null,
			null,
			null,
			null
		]
	} );
} );

Please, tell me where this code to insert?
When I create a page that I put only the code table [table id=5 /]

What version of Atahualpa and WP?
What is the URL?
What table?

atahualpa 3.6.7 WP 3.1.3
http://pcs-nv.ru/?page_id=452
This table is imported from csv using the plugin WP-Table Reloaded. If you look at the third column (only in Opera 11.11), we can see that the numbers are shifted to the second line. I need to set a fixed width of the third column. To do this I need to add code that I wrote above.
Description of the code I took from here sWidth

Please note that the problems with the tables are observed only in Opera. In other browsers, it is no problem.

it may be that opera does not yet support this code. where did you put the code to make it work in the other browsers?

The code I have nowhere to insert, because I do not know where. In other browsers, and without this code, everything works fine. only in Opera's column width is small. I need to register this code to column width has been fixed.