function showSection(sectionId)
{
    try
    {
        for (var i = 0; i < sections.length; i++)
        {
            document.getElementById(sections[i]).style.display = "none";
            document.getElementById("menu_"+sections[i]).className = "";
        }
        
        document.getElementById(sectionId).style.display = "block";
        document.getElementById("menu_"+sectionId).className = "current";
        document.getElementById("menu_"+sectionId).blur();
    }
    catch (e)
    {
        alert("Erro ao tentar mostrar textos.\n" + e);
    }
}

function changeTab(tabs, currentTab)
{
    try
    {
        for (var i = 0; i < tabs.length; i++)
        {
            var tabHeader = document.getElementById(tabs[i] + "_header");
            var tabContent = document.getElementById(tabs[i]);
            if (tabHeader && tabContent)
            {
                tabHeader.className = "tabNotSelected";
                tabContent.style.display = "none";
            }
        }
        
        var cTab = document.getElementById(currentTab);
        var cTabHeader = document.getElementById(currentTab + "_header");
        if (cTab && cTabHeader)
        {
            cTabHeader.className = "tabSelected";
            cTab.style.display = "block";
        }
    }
    catch (e)
    {
        alert("Erro ao tentar mudar de tab.\n" + e);
    }
}