function select_section(section_id)
{
    for (var i = 0; i < sections.length; i++) {
        hide_element(sections[i]);
        menu_elmnt = document.getElementById(sections[i] + '_link');
        if (menu_elmnt) {
            menu_elmnt.style.backgroundImage = 'url(images/menu_grey_1.gif)';
            menu_elmnt.style.color = '#294A84';
        }
    }
    show_element(section_id);
    menu_elmnt = document.getElementById(section_id + '_link');
    if (menu_elmnt) {
        menu_elmnt.style.backgroundImage = 'url(images/menu_blue_1.gif)';
        menu_elmnt.style.color = '#FFFFFF';
    }
}

function show_subsection(menu_item_id, section_id)
{
    $('.subsection').fadeTo('fast', 0).hide();
    //$('#' + menu_item_id).removeClass('submenu_selected');

    $('#' + section_id).show().fadeTo('fast', 1);
    //$('#' + menu_item_id).addClass('submenu_selected');
    //$('#' + menu_item_id).css('background', 'url(images/menu_blue_1.gif)');

    var width = $('#' + menu_item_id).outerWidth();
    var pos    = $('#' + menu_item_id).position();
    var tmp = $('#main_content_content').position();
    var arrow_left = pos.left + Math.round(width / 4);
    var arrow_top = tmp.top - 12;
    
    $('#content_header_arrow_img')
        .css('left', arrow_left)
        .css('top', arrow_top)
        .show();
}

function show_element(elmnt_id)
{
    if (document.getElementById) {
        elmnt = document.getElementById(elmnt_id);
        if (elmnt) {
            elmnt.style.display = 'block';
            elmnt.visibility = 'visible';
        }
    }
}

function hide_element(elmnt_id)
{
    if (document.getElementById) {
        elmnt = document.getElementById(elmnt_id);
        if (elmnt) {
            elmnt.style.display = 'none';
            elmnt.visibility = 'hidden';
        }
    }
}