function getLayer(name) {
        if (is.ns4)
                return findLayer(name, document);
        if (is.ie && !is.dom)
                return eval('document.all.' + name);
        if (is.dom)
                return document.getElementById(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)
                        if ((layer = findLayer(name, layer.document)) != null)
                                return layer;
        }
        return null;
}

//--------------------------------------------------

function hideLayer(layer) {
        if (is.ns4){
                layer.visibility = "hide"
        }else{
                layer.style.visibility = "hidden"
        };
}

function showLayer(layer) {
        if (is.ns4){
                layer.visibility = "show"
        }else{
                layer.style.visibility = "visible"
        };
}

function getVisibility(layer) {

        if (is.ns4) {
                if (layer.visibility == "show")
                        return "visible";
                if (layer.visibility == "hide")
                        return "hidden";
                return layer.visibility;
        }else{
                return layer.style.visibility
        };
        return "";
}

//--------------------------------------------------

function moveLayerTo(layer, x, y) {
        if (is.ns4){
                layer.moveTo(x, y);
        }else{
                layer.style.left = x;
                layer.style.top  = y
        };
}

//--------------------------------------------------

function getImage(name) {
        if (is.ns4){
                return findImage(name, document)
        };
        if (is.ie && !is.dom){
                return eval('document.all.' + name)
        };
        if (is.dom){
                return document.getElementById(name);
        }
        return null;
}

function findImage(name, doc) {
        var i, img;

        for (i = 0; i < doc.images.length; i++)
                if (doc.images[i].name == name)
                        return doc.images[i];
        for (i = 0; i < doc.layers.length; i++)
                if ((img = findImage(name, doc.layers[i].document)) != null) {
                        img.container = doc.layers[i];
                        return img;
                }
        return null;
}

function getImagePageLeft(img) {
        var x, obj;

        if (is.ns4) {
                if (img.container != null)
                        return img.container.pageX + img.x;
                else
                        return img.x;
        }else{
                x = 0;
                obj = img;
                while (obj.offsetParent != null) {
                        x += obj.offsetLeft;
                        obj = obj.offsetParent;
                }
                x += obj.offsetLeft;
                return x;
        };
        return -1;
}

function getImagePageTop(img) {
        var y, obj;
        if (is.ns4) {
                if (img.container != null)
                        return img.container.pageY + img.y;
                else
                        return img.y;
        }else{
                y = 0;
                obj = img;
                while (obj.offsetParent != null) {
                        y += obj.offsetTop;
                        obj = obj.offsetParent;
                }
                y += obj.offsetTop;
                return y;
        };
        return -1;
}