var current_tab = '0';
var current_lv = '0';
var numColumn = 3;
var showMenu = 0;
var customTabOpen = 3;

function show_next_lv1(next_tab) 
{
    $('#1tab' + current_tab).removeClass('on');
    $('#1tab' + next_tab).addClass('on');
    $('#1tab' + current_tab).wrapInner("<a href=\"javascript:void(0);\" id=\"1tab" + current_tab + "-link\"></a>");
    $('#1tab' + next_tab + '-link').replaceWith($('#1tab' + next_tab + '-link').text());

    if (current_tab > 2) {   // currently displaying custom tab
        // hide the tab
        if (next_tab > 2) 
        {
            $('#1tab' + current_tab).hide();
        }
        // hide the content
        $('#tab-' + current_tab + '-0-0').hide();
    }
    else 
    {   // currently displaying non-custom tab
        hide_lv2_tabs();    
        $('#tab-' + current_tab + '-' + current_lv + '-0').hide();
        $('#tab-' + current_tab + '-' + current_lv + '-1').hide();
        $('#tab-' + current_tab + '-' + current_lv + '-2').hide();
    }

    if (next_tab > 2) 
    {   // custom tab is selected
        // show tab
        $('#1tab' + customTabOpen).hide();  // will hide any currently opened custom tab if there any
        $('#1tab' + next_tab).show();
        customTabOpen = next_tab;
        // show content
        $('#tab-' + next_tab + '-0-0').show();
    }
    else 
    {   // non-custom tab is selected
        show_lv2_tabs();
        $('#tab-' + next_tab + '-' + current_lv + '-0').show();
        $('#tab-' + next_tab + '-' + current_lv + '-1').show();
        $('#tab-' + next_tab + '-' + current_lv + '-2').show();
    }

    // in case the box was left opened
    $('#selection_box').removeClass("showMenu");
    showMenu = 0;    
 
    current_tab = next_tab;
}

function show_next_lv2(new_tab2) 
{
    $('#2tab' + current_lv).replaceWith("<a href=\"javascript:void(0);\" onclick =\"show_next_lv2(" + current_lv + ")\" id=\"2tab" + current_lv + "\">" + $('#2tab' + current_lv).text() + "</a>");
    $('#2tab' + new_tab2).replaceWith("<span onclick =\"show_next_lv2(" + new_tab2 + ")\" id=\"2tab" + new_tab2 + "\">" + $('#2tab' + new_tab2).text() + "</span>");

    // close currently opened columns
    $('#tab-' + current_tab + '-' + current_lv + '-0').hide();
    $('#tab-' + current_tab + '-' + current_lv + '-1').hide();
    $('#tab-' + current_tab + '-' + current_lv + '-2').hide();
    
    $('#tab-' + current_tab + '-' + new_tab2 + '-0').show();
    $('#tab-' + current_tab + '-' + new_tab2 + '-1').show();
    $('#tab-' + current_tab + '-' + new_tab2 + '-2').show();
     
    current_lv = new_tab2;
}

function hide_lv2_tabs() 
{
    for (i = 0; i < 5; i++)
    {
        $('#2tab'.concat(i)).hide();
    }
    $('#RssButton').hide();
}

function show_lv2_tabs() 
{
    for (i = 0; i < 5; i++) 
    {
        $('#2tab'.concat(i)).show();
    }
    $('#RssButton').show();
}

function show_selection_box() 
{
    if (showMenu == 0) {
        $('#selection_box').addClass("showMenu");
        showMenu = 1;
    }
    else {
        $('#selection_box').removeClass("showMenu");
        showMenu = 0;
    }
}