/******************************************************************************
* modified for specific purposes: rob@cherny.com, summer 2000                 *
* original code:                                                              *
* dhtmllib.js                                                                 *
*                                                                             *
* Copyright 1999 by Mike Hall.                                                *
* Web address: http://www.brainjar.com                                        *
******************************************************************************/

//-----------------------------------------------------------------------------
// Layer utilities.
//-----------------------------------------------------------------------------

function reverseVisibility(layer)
{
    if (getVisibility(layer) == "visible")
        hideLayer(layer);
    else
        showLayer(layer);
}


function getLayer(name)
{
	if (is_nav4only)
		return findLayer(name, document);
	if (is_nav5up)
		return document.getElementById(name);
	if (is_ie4up)
		return eval('document.all.' + name);
	return null;
}

function findLayer(name, doc) // is_nav4only function
{
	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;
}

//-----------------------------------------------------------------------------
// Layer visibility.
//-----------------------------------------------------------------------------

function hideLayer(layer)
{
	if (is_nav4only)
		layer.visibility = "hide";
	if (is_ie4up || is_nav5up)
		layer.style.visibility = "hidden";
}

function showLayer(layer)
{
	if (is_nav4only)
		layer.visibility = "show";
	if (is_ie4up || is_nav5up)
		layer.style.visibility = "visible";
}

function inheritLayer(layer)
{
	if (is_nav4only)
		layer.visibility = "inherit";
	if (is_ie4up || is_nav5up)
		layer.style.visibility = "inherit";
}

function getVisibility(layer)
{
	if (is_nav4only)
	{
		if (layer.visibility == "show")
			return "visible";
		if (layer.visibility == "hide")
			return "hidden";
		return layer.visibility;
	}
	if (is_ie4up || is_nav5up)
		return layer.style.visibility;
	return "";
}

//-----------------------------------------------------------------------------
// Layer positioning.
//-----------------------------------------------------------------------------

function moveLayerTo(layer, x, y)
{
	if (is_nav4only)
		layer.moveTo(x, y);
	if (is_nav5up)
	{
		layer.style.left = x + "px";
		layer.style.top = y + "px";
	}
	if (is_ie4up)
	{
		layer.style.left = x;
		layer.style.top  = y;
	}
}

function moveLayerBy(layer, dx, dy)
{
	if (is_nav4only)
		layer.moveBy(dx, dy);
	if (is_nav5up)
	{
		layer.style.left = parseInt(layer.style.left) + dx + "px";
		layer.style.top = parseInt(layer.style.top) + dy + "px";
	}
	if (is_ie4up)
	{
		layer.style.pixelLeft += dx;
		// layer.style.left += dx;
		layer.style.pixelTop  += dy;
		// layer.style.top  += dy;
	}
}

function getLeft(layer)
{
	if (is_nav4only)
		return layer.left;
	if (is_nav5up)
		return parseInt(layer.style.left);
	if (is_ie4up)
		return layer.style.pixelLeft;
		//return layer.style.left;
	return -1;
}

function getTop(layer)
{
	if (is_nav4only)
		return layer.top;
	if (is_nav5up)
		return parseInt(layer.style.top);
	if (is_ie4up)
		return layer.style.pixelTop;
	return -1;
}

function getRightEdge(layer)
{
	if (is_nav4only)
		return layer.left + getWidth(layer);
	if (is_nav5up)
	{
		return getLeft(layer) + getWidth(layer);
	}
	if (is_ie4up)
		return layer.style.pixelLeft + getWidth(layer);
	return -1;
}

function getBottomEdge(layer)
{
	if (is_nav4only)
		return layer.top + getHeight(layer);
	if (is_nav5up)
		return getTop(layer) + getHeight(layer);
	if (is_ie4up)
		return layer.style.pixelTop + getHeight(layer);
	return -1;
}

function getPageLeft(layer)
{
 var x;

	if (is_nav4only)
		return layer.pageX;
	if (is_nav5up)
	{
		return layer.offsetLeft //+ layer.offsetParent; //offsetParent doesn't seem to do anything, offsetLeft seems to return true offsetLeft regardless of parent ... must research further ... 
	}
	if (is_ie4up)
	{
		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 (is_nav4only)
		return layer.pageY;
	if (is_nav5up)
		return layer.offsetTop; // please see above ... 
	if (is_ie4up)
	{
		y = 0;
		while (layer.offsetParent != null)
		{
			y += layer.offsetTop;
			layer = layer.offsetParent;
		}
		y += layer.offsetTop;
		return y;
	}
	return -1;
}

function getWidth(layer)
{
	if (is_nav4only)
	{
		if (layer.document.width)
		return layer.document.width;
	else
		return layer.clip.right - layer.clip.left;
	}
	if (is_nav5up)
		return layer.offsetWidth;
	if (is_ie4up)
	{
		if (layer.style.pixelWidth)
			return layer.style.pixelWidth;
		else
			return layer.clientWidth;
	}
	return -1;
}

function getHeight(layer)
{
	if (is_nav4only)
	{
		if (layer.document.height)
			return layer.document.height;
		else
			return layer.clip.bottom - layer.clip.top;
	}
	if (is_nav5up)
		return layer.offsetHeight;
	if (is_ie4up)
	{
		if (layer.style.pixelHeight)
			return layer.style.pixelHeight;
		else
			return layer.clientHeight;
	}
	return -1;
}

function getzIndex(layer)
{
	if (is_nav4only)
		return layer.zIndex;
	if (is_ie4up || is_nav5up)
		return layer.style.zIndex;
	return -1;
}

function setzIndex(layer, z)
{
	if (is_nav4only)
		layer.zIndex = z;
	if (is_ie4up || is_nav5up)
		layer.style.zIndex = z;
}

//-----------------------------------------------------------------------------
// Layer clipping.
// NOT ADAPTED TO MOZILLA YET (???)
//-----------------------------------------------------------------------------

function clipLayer(layer, clipleft, cliptop, clipright, clipbottom)
{
	if (is_nav4only)
	{
		layer.clip.left   = clipleft;
		layer.clip.top    = cliptop;
		layer.clip.right  = clipright;
		layer.clip.bottom = clipbottom;
	}
	if (is_ie4up || is_nav5up)
	layer.style.clip = 'rect(' + cliptop + ' ' +  clipright + ' ' + clipbottom + ' ' + clipleft +')';
}

function getClipLeft(layer)
{
	if (is_nav4only)
		return layer.clip.left;
	if (is_ie4up || is_nav5up)
	{
		var str =  layer.style.clip;
		if (!str)
			return 0;
		var clip = getIEClipValues(layer.style.clip);
		return(clip[3]);
	}
	return -1;
}

function getClipTop(layer)
{
	if (is_nav4only)
		return layer.clip.top;
	if (is_ie4up || is_nav5up)
	{
		var str =  layer.style.clip;
		if (!str)
			return 0;
		var clip = getIEClipValues(layer.style.clip);
		return clip[0];
	}
	return -1;
}

function getClipRight(layer)
{
	if (is_nav4only)
		return layer.clip.right;
	if (is_ie4up || is_nav5up)
	{
		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 (is_nav4only)
		return layer.clip.bottom;
	if (is_ie4up || is_nav5up)
	{
		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 (is_nav4only)
		return layer.clip.width;
	if (is_ie4up || is_nav5up)
	{
		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 (is_nav4only)
		return layer.clip.height;
	if (is_ie4up || is_nav5up)
	{
		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) // ALSO IS_NAV5UP?????
{
	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.
// NOT UPGRADED TO MOZILLA YET (?)
//-----------------------------------------------------------------------------

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 (is_nav4only)
		layer.bgColor = color;
	if (is_ie4up || is_nav5up)
		layer.style.backgroundColor = color;
}

function setBgImage(layer, src)
{
	if (is_nav4only)
		layer.background.src = src;
	if (is_ie4up || is_nav5up)
		layer.style.backgroundImage = "url(" + src + ")";
}


//-----------------------------------------------------------------------------
// Image utilities.
//-----------------------------------------------------------------------------

function getImage(name)
{
	if (is_nav4only)
	{
		return findImage(name, document);
	}
	if (is_nav5up)
		return document.images[name];
	if (is_ie4up)
		return eval('document.all.' + name);
	return null;
}

function findImage(name, doc) // is_nav4only code
{
	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_nav4only)
	{
		if (img.container != null)
			return img.container.pageX + img.x;
		else
		return img.x;
	}
	if (is_ie4up || is_nav5up)
	{
		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_nav4only)
	{
		if (img.container != null)
			return img.container.pageY + img.y;
		else
		return img.y;
	}
	if (is_ie4up || is_nav5up)
	{
		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 (is_nav4only)
		return window.innerWidth; 
	if (is_nav5up)
		return window.outerWidth; // includes chrome, hence "get_WINDOW_WIDTH"
	if (is_ie4up)
		return document.body.clientWidth;
	return -1;
}

function getWindowHeight()
{
	if (is_nav4only)
		return window.innerHeight; 
	if (is_nav5up)
		return window.outerHeight; // includes chrome, hence "get_WINDOW_HEIGHT"
	if (is_ie4up)
		return document.body.clientHeight;
	return -1;
}

function getPageWidth()
{
	if (is_nav4only)
		return document.width;
	if (is_nav5up)
		return window.innerWidth; // innerWidth excludes chrome
	if (is_ie4up)
		return document.body.scrollWidth;
	return -1;
}

function getPageHeight()
{
	if (is_nav4only)
		return document.height;
	if (is_nav5up)
		return window.innerHeight; // innerHeight excludes chrome;
	if (is_ie4up)
		return document.body.scrollHeight;
	return -1;
}

function getPageScrollX()
{
	if (is_nav4only || is_nav5up)
		return window.pageXOffset;
	if (is_ie4up)
		return document.body.scrollLeft;
	return -1;
}

function getPageScrollY()
{
	if (is_nav4only || is_nav5up)
		return window.pageYOffset;
	if (is_ie4up)
		return document.body.scrollTop;
	return -1;
}


function makeInt(vari)
{
   return (vari.substring(0, vari.length-2));
}