// 브라우저 판별

var isMinNS4 = (navigator.appName.indexOf("Netscape") >= 0 &&
                parseFloat(navigator.appVersion) >= 4) ? 1 : 0;
var isMinIE4 = (document.all) ? 1 : 0;
var isMinIE5 = (isMinIE4 && navigator.appVersion.indexOf("5.")) >= 0 ? 1 : 0;

//alert(isMinIE5);

//-----------------------------------------------------------------------------
// 레이어 속성
//-----------------------------------------------------------------------------

function hideLayer(layer) {

    if (isMinNS4)
        layer.visibility = "hide";
    if (isMinIE4)
        layer.style.visibility = "hidden";
}

function showLayer(layer) {

    if (isMinNS4)
        layer.visibility = "show";
    if (isMinIE4)
        layer.style.visibility = "visible";
}

function isVisible(layer) {

    if (isMinNS4 && layer.visibility == "show")
        return (true);
    if (isMinIE4 && layer.style.visibility == "visible")
        return (true);

    return (false);
}

//-----------------------------------------------------------------------------
// 레이어의 위치
//-----------------------------------------------------------------------------

function moveLayerTo(layer, x, y) {

    if (isMinNS4)
        layer.moveTo(x, y);
    if (isMinIE4) {
        layer.style.left = x;
        layer.style.top = y;
    }
}

function moveLayerBy(layer, dx, dy) {

    if (isMinNS4)
        layer.moveBy(dx, dy);
    if (isMinIE4) {
        layer.style.pixelLeft += dx;
        layer.style.pixelTop += dy;
    }
}

function getLeft(layer) {

    if (isMinNS4)
        return (layer.left);
    if (isMinIE4)
        return (layer.style.pixelLeft);
    return (-1);
}

function getTop(layer) {

    if (isMinNS4)
        return (layer.top);
    if (isMinIE4)
        return (layer.style.pixelTop);
    return (-1);
}

function getRight(layer) {

    if (isMinNS4)
        return (layer.left + getWidth(layer));
    if (isMinIE4)
        return (layer.style.pixelLeft + getWidth(layer));
    return (-1);
}

function getBottom(layer) {

    if (isMinNS4)
        return (layer.top + getHeight(layer));
    else if (isMinIE4)
        return (layer.style.pixelTop + getHeight(layer));
    return (-1);
}

function getPageLeft(layer) {

    if (isMinNS4)
        return (layer.pageX);
    if (isMinIE4)
        return (layer.offsetLeft);
    return (-1);
}

function getPageTop(layer) {

    if (isMinNS4)
        return (layer.pageY);
    if (isMinIE4)
        return (layer.offsetTop);
    return (-1);
}

function getWidth(layer) {

    if (isMinNS4) {
        if (layer.document.width)
            return (layer.document.width);
        else
            return (layer.clip.right - layer.clip.left);
    }
    if (isMinIE4) {
        if (layer.style.pixelWidth)
            return (layer.style.pixelWidth);
        else
            return (layer.clientWidth);
    }
    return (-1);
}

function getHeight(layer) {

    if (isMinNS4) {
        if (layer.document.height)
            return (layer.document.height);
        else
            return (layer.clip.bottom - layer.clip.top);
    }
    if (isMinIE4) {
        if (false && layer.style.pixelHeight)
            return (layer.style.pixelHeight);
        else
            return (layer.clientHeight);
    }
    return (-1);
}

function getzIndex(layer) {

    if (isMinNS4)
        return (layer.zIndex);
    if (isMinIE4)
        return (layer.style.zIndex);

    return (-1);
}

function setzIndex(layer, z) {

    if (isMinNS4)
        layer.zIndex = z;
    if (isMinIE4)
        layer.style.zIndex = z;
}

//-----------------------------------------------------------------------------
// 레이어 클리핑
//-----------------------------------------------------------------------------

function clipLayer(layer, clipleft, cliptop, clipright, clipbottom) {

    if (isMinNS4) {
        layer.clip.left = clipleft;
        layer.clip.top = cliptop;
        layer.clip.right = clipright;
        layer.clip.bottom = clipbottom;
    }
    if (isMinIE4)
       // alert('1');
        layer.style.clip = 'rect(' + cliptop + ' ' + clipright + ' ' + clipbottom + ' ' + clipleft + ')';
}

function getClipLeft(layer) {

    if (isMinNS4)
        return (layer.clip.left);
    if (isMinIE4) {
        var str = layer.style.clip;
        if (!str)
            return (0);
        var clip = getIEClipValues(layer.style.clip);
        return (clip[3]);
    }
    return (-1);
}

function getClipTop(layer) {

    if (isMinNS4)
        return (layer.clip.top);
    if (isMinIE4) {
        var str = layer.style.clip;
        if (!str)
            return (0);
        var clip = getIEClipValues(layer.style.clip);
        return (clip[0]);
    }
    return (-1);
}

function getClipRight(layer) {

    if (isMinNS4)
        return (layer.clip.right);
    if (isMinIE4) {
        var str = layer.style.clip;
        if (!str)
            return (layer.style.pixelWidth);
        var clip = getIEClipValues(layer.style.clip);
        return (clip[1]);
    }
    return (-1);
}

function getClipBottom(layer) {

    if (isMinNS4)
        return (layer.clip.bottom);
    if (isMinIE4) {
        var str = layer.style.clip;
        if (!str)
            return (layer.style.pixelHeight);
        var clip = getIEClipValues(layer.style.clip);
        return (clip[2]);
    }
    return (-1);
}

function getClipWidth(layer) {

    if (isMinNS4)
        return (layer.clip.width);
    if (isMinIE4) {
        var str = layer.style.clip;
        if (!str)
            return (layer.style.pixelWidth);
        var clip = getIEClipValues(layer.style.clip);
        return (clip[1] - clip[3]);
    }
    return (-1);
}

function getClipHeight(layer) {

    if (isMinNS4)
        return (layer.clip.height);
    if (isMinIE4) {
        var str = layer.style.clip;
        if (!str)
            return (layer.style.pixelHeight);
        var clip = getIEClipValues(layer.style.clip);
        return (clip[2] - clip[0]);
    }
    return (-1);
}

function getIEClipValues(str) {

    var clip = new Array();
    var i;

    // 익스플로러용 레이어의 클리핑값 파싱

    i = str.indexOf("(");
    clip[0] = parseInt(str.substring(i + 1, str.length), 10);
    i = str.indexOf(" ", i + 1);
    clip[1] = parseInt(str.substring(i + 1, str.length), 10);
    i = str.indexOf(" ", i + 1);
    clip[2] = parseInt(str.substring(i + 1, str.length), 10);
    i = str.indexOf(" ", i + 1);
    clip[3] = parseInt(str.substring(i + 1, str.length), 10);
    return (clip);
}

//-----------------------------------------------------------------------------
// 레이어 스크롤
//-----------------------------------------------------------------------------

function scrollLayerTo(layer, x, y, bound) {

    var dx = getClipLeft(layer) - x;
    var dy = getClipTop(layer) - y;

    scrollLayerBy(layer, -dx, -dy, bound);
}

function scrollLayerBy(layer, dx, dy, bound) {

    var cl = getClipLeft(layer);
    var ct = getClipTop(layer);
    var cr = getClipRight(layer);
    var cb = getClipBottom(layer);

    if (bound) {
        if (cl + dx < 0)

            dx = -cl;

        else if (cr + dx > getWidth(layer))
            dx = getWidth(layer) - cr;
        if (ct + dy < 0)

            dy = -ct;

        else if (cb + dy > getHeight(layer))
            dy = getHeight(layer) - cb;
    }

    clipLayer(layer, cl + dx, ct + dy, cr + dx, cb + dy);
    moveLayerBy(layer, -dx, -dy);
}

//-----------------------------------------------------------------------------
// 레이어의 배경
//-----------------------------------------------------------------------------

function setBgColor(layer, color) {

    if (isMinNS4)
        layer.bgColor = color;
    if (isMinIE4)
        layer.style.backgroundColor = color;
}

function setBgImage(layer, src) {

    if (isMinNS4)
        layer.background.src = src;
    if (isMinIE4)
        layer.style.backgroundImage = "url(" + src + ")";
}

//-----------------------------------------------------------------------------
// 레이어 유틸리티
//-----------------------------------------------------------------------------

function getLayer(name) {

    if (isMinNS4)
        return findLayer(name, document);
    if (isMinIE4)
        return eval('document.all.' + name);

    return null;
}

function findLayer(name, doc) {

    var i, layer;

    for (i = 0; i < doc.layers.length; i++) {
        layer = doc.layers[i];
        if (layer.name == name)
            return layer;
        if (layer.document.layers.length > 0) {
            layer = findLayer(name, layer.document);
            if (layer != null)
                return layer;
        }
    }

    return null;
}

//-----------------------------------------------------------------------------
// 윈도우와 페이지 속성
//-----------------------------------------------------------------------------

function getWindowWidth() {

    if (isMinNS4)
        return (window.innerWidth);
    if (isMinIE4)
        return (document.body.clientWidth);
    return (-1);
}

function getWindowHeight() {

    if (isMinNS4)
        return (window.innerHeight);
    if (isMinIE4)
        return (document.body.clientHeight);
    return (-1);
}

function getPageWidth() {

    if (isMinNS4)
        return (document.width);
    if (isMinIE4)
        return (document.body.scrollWidth);
    return (-1);
}

function getPageHeight() {

    if (isMinNS4)
        return (document.height);
    if (isMinIE4)
        return (document.body.scrollHeight);
    return (-1);
}

function getPageScrollX() {

    if (isMinNS4)
        return (window.pageXOffset);
    if (isMinIE4)
        return (document.body.scrollLeft);
    return (-1);
}

function getPageScrollY() {

    if (isMinNS4)
        return (window.pageYOffset);
    if (isMinIE4)
        return (document.body.scrollTop);
    return (-1);
}