/* ***********************************************************
Example 4-5 (DHTMLapi.js)
"Dynamic HTML:The Definitive Reference"
by Danny Goodman
Published by O'Reilly & Associates  ISBN 1-56592-494-0
http://www.oreilly.com
Copyright 1998 Danny Goodman.  All Rights Reserved.
************************************************************ */
// DHTMLapi.js custom API for cross-platform
// object positioning by Danny Goodman (http://www.dannyg.com)

// Global variables
var isNav, isIE
var coll = ""
var styleObj = ""
if (parseInt(navigator.appVersion) >= 4) {
	if (navigator.appName == "Netscape") {
		isNav = true
	} else {
		isIE = true
		coll = "all."
		styleObj = ".style"
	}
}

// Convert object name string or object reference
// into a valid object reference
function getObject(obj) {
	var theObj
	if (typeof obj == "string") {
		theObj = eval("document." + coll + obj + styleObj)
	} else {
		theObj = obj
	}
	return theObj
}

// Positioning an object at a specific pixel coordinate
function shiftTo(obj, x, y) {
	var theObj = getObject(obj)
	if (isNav) {
		theObj.moveTo(x,y)
	} else {
		theObj.pixelLeft = x
		theObj.pixelTop = y
	}
}

// Moving an object by x and/or y pixels
function shiftBy(obj, deltaX, deltaY) {
	var theObj = getObject(obj)
	if (isNav) {
		theObj.moveBy(deltaX, deltaY)
	} else {
		theObj.pixelLeft += deltaX
		theObj.pixelTop += deltaY
	}
}

// Setting the z-order of an object
function setZIndex(obj, zOrder) {
	var theObj = getObject(obj)
	theObj.zIndex = zOrder
}

// Setting the background color of an object
function setBGColor(obj, color) {
	var theObj = getObject(obj)
	if (isNav) {
		theObj.bgColor = color
	} else {
		theObj.backgroundColor = color
	}
}

// Setting the visibility of an object to visible
function show(obj) {
	var theObj = getObject(obj)
	theObj.visibility = "visible"
}

// Setting the visibility of an object to hidden
function hide(obj) {
	var theObj = getObject(obj)
	theObj.visibility = "hidden"
}

// Retrieving the x coordinate of a positionable object
function getObjectLeft(obj)  {
	var theObj = getObject(obj)
	if (isNav) {
		return theObj.left
	} else {
		return theObj.pixelLeft
	}
}

// Retrieving the y coordinate of a positionable object
function getObjectTop(obj)  {
	var theObj = getObject(obj)
	if (isNav) {
		return theObj.top
	} else {
		return theObj.pixelTop
	}
}

// Returns width of browser window
function getInsideWindowWidth() {
	if (isNav) {
		return window.innerWidth;
	} else {
		return document.body.clientWidth;
	}
}