// Determine browser.
var isMinNS4 = document.layers
var ie=document.all&&navigator.userAgent.indexOf("Opera")==-1
var dom=document.getElementById&&!ie&&navigator.userAgent.indexOf("Opera")==-1

// Layer visibility.
function hideLayer(layer) {
	if (isMinNS4) layer.visibility = "hide";
	if (ie||dom) layer.style.visibility = "hidden";
}
function showLayer(layer) {
	if (isMinNS4) layer.visibility = "show";
	if (ie||dom) layer.style.visibility = "visible";
}
function inheritLayer(layer) {
	if (isMinNS4) layer.visibility = "inherit";
	if (ie||dom) 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 (ie||dom) return layer.style.visibility;
	return "";
}
function isVisible(layer) {
	if (isMinNS4 && layer.visibility == "show") return(true);
	if (ie||dom && layer.style.visibility == "visible") return(true);
	return(false);
}

// Layer positioning.
function moveLayerTo(layer, x, y) {
	if (isMinNS4) layer.moveTo(x, y);
	if (ie||dom) {
		layer.style.left = x;
		layer.style.top  = y;
	}
}
function moveLayerBy(layer, dx, dy) {
	if (isMinNS4) layer.moveBy(dx, dy);
	if (ie||dom) {
		layer.style.left= parseInt(layer.style.left)+dx;
		layer.style.top= parseInt(layer.style.top)+dy;
	}
}
function getLeft(layer) {
	if (isMinNS4) return(layer.left);
	if (ie||dom) return(parseInt(layer.style.left));
	return(-1);
}
function getTop(layer) {
	if (isMinNS4) return(layer.top);
	if (ie||dom) return(parseInt(layer.style.top));
	return(-1);
}
function getRight(layer) {
	if (isMinNS4) return(layer.left + getWidth(layer));
	if (ie||dom) return(parseInt(layer.style.left) + getWidth(layer));
	return(-1);
}
function getBottom(layer) {
	if (isMinNS4) return(layer.top + getHeight(layer));
	else if (ie||dom) return(parseInt(layer.style.top) + getHeight(layer));
	return(-1);
}
function getPageLeft(layer) {
	if (isMinNS4) return(layer.pageX);
	if (ie||dom) return(layer.offsetLeft);
	return(-1);
}
function getPageTop(layer) {
	if (isMinNS4) return(layer.pageY);
	if (ie||dom) 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 (ie||dom) {
		if (layer.style.width) return(layer.style.width);
		else return(layer.offsetWidth);
	}
	return(-1);
}
function getHeight(layer) {
	if (isMinNS4) {
		if (layer.document.height) return(layer.document.height);
		else return(layer.clip.bottom - layer.clip.top);
	}
	if (ie||dom) {
		if (false && layer.style.height) return(layer.style.height);
		else return(layer.offsetHeight);
	}
	return(-1);
}
function getzIndex(layer) {
	if (isMinNS4) return(layer.zIndex);
	if (ie||dom) return(layer.style.zIndex);
	return(-1);
}
function setzIndex(layer, z) {
	if (isMinNS4) layer.zIndex = z;
	if (ie||dom) 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 (ie||dom) layer.style.clip = 'rect('+ cliptop +' '+ clipright +' '+ clipbottom +' '+ clipleft +')';
}
function getClipLeft(layer) {
	if (isMinNS4) return(layer.clip.left);
	if (ie||dom) {
		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 (ie||dom) {
		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 (ie||dom) {
		var str =  layer.style.clip;
		if (!str) return(layer.style.width);
		var clip = getIEClipValues(layer.style.clip);
		return(clip[1]);
	}
	return(-1);
}
function getClipBottom(layer) {
	if (isMinNS4) return(layer.clip.bottom);
	if (ie||dom) {
		var str =  layer.style.clip;
		if (!str) return(layer.style.height);
		var clip = getIEClipValues(layer.style.clip);
		return(clip[2]);
	}
	return(-1);
}
function getClipWidth(layer) {
	if (isMinNS4) return(layer.clip.width);
	if (ie||dom) {
		var str = layer.style.clip;
		if (!str) return(layer.style.width);
		var clip = getIEClipValues(layer.style.clip);
		return(clip[1] - clip[3]);
	}
	return(-1);
}
function getClipHeight(layer) {
	if (isMinNS4) return(layer.clip.height);
	if (ie||dom) {
		var str =  layer.style.clip;
		if (!str) return(layer.style.height);
		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 (ie||dom) layer.style.backgroundColor = color;
}
function setBgImage(layer, src) {
	if (isMinNS4) layer.background.src = src;
	if (ie||dom) layer.style.backgroundImage = "url(" + src + ")";
}

// Layer utilities.
function getLayer(name) {
	if (isMinNS4) return findLayer(name, document);
	if (ie) return eval('document.all.' + name);
	if (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) {
			layer = findLayer(name, layer.document);
			if (layer != null) return layer;
		}
	}
	return null;
}

// Window and page properties.
function getWindowWidth() {
	if (isMinNS4||dom) return(window.innerWidth);
	if (ie) return(document.body.clientWidth);
	return(-1);
}
function getWindowHeight() {
	if (isMinNS4||dom) return(window.innerHeight);
	if (ie) return(document.body.clientHeight);
	return(-1);
}
function getPageWidth() {
	if (isMinNS4||dom) return(document.width);
	if (ie) return(document.body.scrollWidth);
	return(-1);
}
function getPageHeight() {
	if (isMinNS4||dom) return(document.height);
	if (ie) return(document.body.scrollHeight);
	return(-1);
}
function getPageScrollX() {
	if (isMinNS4||dom) return(window.pageXOffset);
	if (ie) return(document.body.scrollLeft);
	return(-1);
}
function getPageScrollY() {
	if (isMinNS4||dom) return(window.pageYOffset);
	if (ie) return(document.body.scrollTop);
	return(-1);
}