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// gnb
var isNav = false;
var isFirst = true;

$('#gnb li.d1').hover(function () {

    if (isFirst == true) {
        $(this).children().slideDown('fast');
        isFirst = false;
    } else {
        $(this).children().show()
    }
    $(this).siblings().children('div.sub').hide();
    $('#gnb a.d1 img').imgSrcToggle({
        orgSrc: '_on',
        newSrc: '_off'
    });
    $(this).children().children().imgSrcToggle({
        orgSrc: '_off',
        newSrc: '_on'
    });
    isNav = true;
}, function () {
    isNav = false;
});

$('#gnb li.d2').hover(function () {
    $(this).children('a.d2').children('img').imgSrcToggle({
        orgSrc: '_off',
        newSrc: '_on'
    });
}, function () {
    $(this).children('a.d2').children('img').imgSrcToggle({
        orgSrc: '_on',
        newSrc: '_off'
    });
});

function closeNav() {
    $('#gnb li.d1 div.sub').slideUp('fast');
    $('#gnb a.d1 img').imgSrcToggle({
        orgSrc: '_on',
        newSrc: '_off'
    });
    isFirst = true;
}

timer = setInterval(function () {
    if (isNav == false) {
        closeNav();
    };
}, 1000);