var IE4 = (document.all && !document.getElementById) ? true : false;
var NS4 = (document.layers) ? true : false;
var IE5 = (document.all && document.getElementById) ? true : false;
var NS6 = (document.getElementById && !document.all) ? true : false;
var IE = (IE4 || IE5) ? true : false
var NS = (NS4 || NS6) ? true : false
var isNav = NS
var isIE = IE
var coll = (IE) ? "all." : ""
var styleObj = (IE) ? ".style" : ""
if(NS){var hide="hide";var show="show"}
if(IE){var hide="hidden";var show="visible"}

function changeMe(name,toThis) {
	if (document.getElementById){
		document.getElementById(name).innerHTML = toThis
	} else if (document.layers){
        document.layers[name].document.close()
        document.layers[name].document.write(toThis)
        document.layers[name].document.close()
	} else if (document.all) {
		test = eval("document.all." + name)
		test.innerHTML = toThis
  	}
}

// Convert object name string or object reference
// into a valid object reference
function getObject(obj) {
	var theObj
	if (typeof obj == "string") {
		if(document.getElementById){
			theObj = document.getElementById(obj).style
		} else {
			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 text colour of an object
function setTxtColor(obj, color) {
	var theObj = getObject(obj)
	if (isNav) {
		//theObj.bgColor = color
	} else {
		theObj.color = 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
	}
}

// Utility function returns rendered height of object content in pixels
function getObjHeight(obj) {
	if (isNav) {
		return obj.clip.height
	} else {
		return obj.clientHeight
	}
}
// Utility function returns rendered width of object content in pixels
function getObjWidth(obj) {
	var theObj = getObject(obj)
	if (isNav) {
		return theObj.clip.width
	} else {
		return theObj.clientWidth
	}
}
// Utility function returns the available content width space in browser window
function getInsideWindowWidth() {
	if (isNav) {
		return window.innerWidth
	} else {
		return document.body.clientWidth
	}
}
// Utility function returns the available content height space in browser window
function getInsideWindowHeight() {
	if (isNav) {
		return window.innerHeight
	} else {
		return document.body.clientHeight
	}
}