By the way, I have found the solution for the problem with the second level in menu, the solution was where JA Developer says on the top: http://www.joomlart.com/forums/topic/submenu-does-no-show-properly-in-ie6/, I have tried a lot of things that there people says, but only work this solutions: (at least for my in JA OPAL):
In the file ie.php located into the template, you must remove the line: 118 to 121, it`s to say remove this:
#ja-cssmenu li ul {
filter: progid: DXImageTransform.Microsoft.AlphaImageLoader(src='<?php echo $template_path; ?>/images/trans-bg.png’, sizingMethod=’scale’);
background-image: none;
}