// Determine browser.

isMinNS4 = (document.layers) ? 1 : 0;
//var isMinNS4 = (navigator.appName.indexOf("Netscape") >= 0 && parseFloat(navigator.appVersion) >= 4) ? 1 : 0;
isMinIE4 = (document.all) ? 1 : 0;
//var isMinIE5 = (isMinIE4 && navigator.appVersion.indexOf("5.") >= 0) ? 1 : 0;
isW3C = (document.getElementById) ? 1 : 0;// W3C stands for the W3C standard, implemented in Mozilla (and Netscape 6) and IE5
isMinIE5 = isW3C;

// Layer visibility.

function hideLayer(layer) {

	if (isMinNS4)
		layer.visibility = "hide";
	if (isMinIE4 || isW3C)
		layer.style.visibility = "hidden";
}

function showLayer(layer) {

	if (isMinNS4)
		layer.visibility = "show";
	if (isMinIE4 || isW3C)
		layer.style.visibility = "visible";
}

function inheritLayer(layer) {

	if (isMinNS4)
		layer.visibility = "inherit";
	if (isMinIE4 || isW3C)
		layer.style.visibility = "inherit";
}

function getVisibility(layer) {

	if (isMinNS4) {
		if (layer.visibility == "show")
			return "visible";
		if (layer.visibility == "hide")
			return "hidden";
		return layer.visibility;
	}
	if (isMinIE4 || isW3C)
		return layer.style.visibility;
	return "";
}


// Layer positioning.

function moveLayerTo(layer, x, y) {

	if (isMinNS4)
		layer.moveTo(x, y);
	if (isMinIE4 || isW3C) {
		layer.style.left = x;
		layer.style.top  = y;
	}
}

function moveLayerBy(layer, dx, dy) {

	if (isMinNS4)
		layer.moveBy(dx, dy);
	if (isMinIE4 || isW3C) {
		layer.style.pixelLeft += dx;
		layer.style.pixelTop  += dy;
	}
}

function getLeft(layer) {

	if (isMinNS4)
		return layer.left;
	if (isMinIE4 || isW3C)
		return layer.style.pixelLeft;
	return -1;
}

function getTop(layer) {

	if (isMinNS4)
		return layer.top;
	if (isMinIE4 || isW3C)
		return layer.style.pixelTop;
	return -1;
}

function getRight(layer) {

	if (isMinNS4)
		return layer.left + getWidth(layer);
	if (isMinIE4 || isW3C)
		return layer.style.pixelLeft + getWidth(layer);
	return -1;
}

function getBottom(layer) {

	if (isMinNS4)
		return layer.top + getHeight(layer);
	if (isMinIE4 || isW3C)
		return layer.style.pixelTop + getHeight(layer);
	return -1;
}

function getPageLeft(layer) {

	var x;
	
	if (isMinNS4)
		return layer.pageX;
	if (isMinIE4 || isW3C) {
		x = 0;
		while (layer.offsetParent != null) {
			x += layer.offsetLeft;
			layer = layer.offsetParent;
		}
		x += layer.offsetLeft;
		return x;
	}
	return -1;
}

function getPageTop(layer) {

	var y;
	
	if (isMinNS4)
		return layer.pageY;
	if (isMinIE4 || isW3C) {
		y = 0;
		while (layer.offsetParent != null) {
			y += layer.offsetTop;
			layer = layer.offsetParent;
		}
		y += layer.offsetTop;
		return y;
	}
	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 || isW3C) {
		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 || isW3C) {
		if (layer.style.pixelHeight)
			return layer.style.pixelHeight;
		else
			return layer.clientHeight;
	}
	return -1;
}

function getzIndex(layer) {

	if (isMinNS4)
		return layer.zIndex;
	if (isMinIE4 || isW3C)
		return layer.style.zIndex;

	return -1;
}

function setzIndex(layer, z) {

	if (isMinNS4)
		layer.zIndex = z;
	if (isMinIE4 || isW3C)
		layer.style.zIndex = z;
}


// Layer clipping.

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 || isW3C)
		layer.style.clip = 'rect(' + cliptop + ' ' +  clipright + ' ' + clipbottom + ' ' + clipleft +')';
}

function getClipLeft(layer) {

	if (isMinNS4)
		return layer.clip.left;
	if (isMinIE4 || isW3C) {
		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 || isW3C) {
		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 || isW3C) {
		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 || isW3C) {
		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 || isW3C) {
		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 || isW3C) {
		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;
	
	// Parse out the clipping values for IE layers.
	
	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;
}


// Layer scrolling.

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);
}


// Layer background.

function setBgColor(layer, color) {

	if (isMinNS4)
		layer.bgColor = color;
	if (isMinIE4 || isW3C)
		layer.style.backgroundColor = color;
}

function setBgImage(layer, src) {

	if (isMinNS4)
		layer.background.src = src;
	if (isMinIE4 || isW3C)
		layer.style.backgroundImage = "url(" + src + ")";
}


// Layer utilities.

function getLayer(name) {

	isMinNS4 = (document.layers) ? 1 : 0;
	isMinIE4 = (document.all) ? 1 : 0;
	isW3C = (document.getElementById) ? 1 : 0;

	if (name == 0) return null;
	
	if (isMinNS4)
		return findLayer(name, document);
	if (isMinIE4)
		return eval('document.all.' + name);
	if (isW3C)
		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;
}


// Image utilities.

function getImage(name) {

	if (isMinNS4) {
		return findImage(name, document);
	}
	if (isMinIE4)
		return eval('document.all.' + name);
	if (isW3C)
		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 (isMinNS4) {
		if (img.container != null)
			return img.container.pageX + img.x;
		else
			return img.x;
	}
	if (isMinIE4 || isW3C) {
		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 (isMinNS4) {
		if (img.container != null)
			return img.container.pageY + img.y;
		else
			return img.y;
	}
	if (isMinIE4 || isW3C) {
		y = 0;
		obj = img;
		while (obj.offsetParent != null) {
			y += obj.offsetTop;
			obj = obj.offsetParent;
		}
		y += obj.offsetTop;
		return y;
	}
	return -1;
}


// Window and page properties.

function getWindowWidth() {

	if (isMinNS4)
		return window.innerWidth;
	if (isMinIE4 || isW3C)
		return document.body.clientWidth;
	return -1;
}

function getWindowHeight() {

	if (isMinNS4)
		return window.innerHeight;
	if (isMinIE4 || isW3C)
		return document.body.clientHeight;
	return -1;
}

function getPageWidth() {

	if (isMinNS4)
		return document.width;
	if (isMinIE4 || isW3C)
		return document.body.scrollWidth;
	return -1;
}

function getPageHeight() {

	if (isMinNS4)
		return document.height;
	if (isMinIE4 || isW3C)
		return document.body.scrollHeight;
	return -1;
}

function getPageScrollX() {

	if (isMinNS4)
		return window.pageXOffset;
	if (isMinIE4 || isW3C)
		return document.body.scrollLeft;
	return -1;
}

function getPageScrollY() {

	if (isMinNS4)
		return window.pageYOffset;
	if (isMinIE4 || isW3C)
		return document.body.scrollTop;
	return -1;
}