a programmer' solution   :)    :

function splitSubMenu(columns) {

    jQuery("div.sub").each(function (i) {
        if (i==1)
        {
            columns=2;
        }
        else
        {
            columns=3;
        }
        var items = jQuery(this).find('ul');
        var blockCount = columns;
.................


where i is the number of the menu, starting with 0

So, is there also a solution only with CSS? If yes, please guide me.

Catalin

Earlier this year I worked with SportsDirect to move their Lonsdale ecommerce site to DotNetNuke.  As you can see on that site, we needed to be able to show different menus in either 1, 2 or 3 columns.  I created a custom taxonomy vocabulary which included some CSS classes I wanted to use, and then assigned different pages on the site with the needed tags that could be read by the DDR Menu renderer.  In this case I used a Razor template so that I could read the page properties and then assign classes as appropriate.  I'm working on a blog post that explains all of this and should have it posted in a few hours.