var navigationMenuSmoothness = 300;
var navigationMouseFlag = false;
var navigationMenuCloseTrigger = false;

function navigationMenuIsOpen(tabNo)
{
    var currentNavigationMenu = $('#navigation-menu-'+tabNo);
    return (currentNavigationMenu.css('display')!='none');
}

function closeNavigationTab()
{
if (!navigationMouseFlag) $('.navigation-menu').hide();
navigationMenuCloseTrigger = false;
}


function navigationTabHover(tabNo)
{
    if (!navigationMenuIsOpen(tabNo)) $('.navigation-menu').hide();
    navigationMouseFlag = true;
    $('#navigation-menu-'+tabNo).show();
}

function navigationExit()
{
    navigationMouseFlag = false;
    if (!navigationMenuCloseTrigger)
        {
        navigationMenuCloseTrigger = true;
        setTimeout('closeNavigationTab();', navigationMenuSmoothness);
        }
}

function navigationMenuHover()
{
    navigationMouseFlag = true;
}