// Dynamic Layer Object
// sophisticated layer/element targeting and animation object which provides the core functionality needed in most DHTML applications
// 19990604

// NewsTicker Object
// an animated news ticker
// 19990623

// Copyright (C) 1999 Dan Steinman
// Distributed under the terms of the GNU Library General Public License
// Available at http://www.dansteinman.com/dynduo/

function DynLayer(id,nestref,frame) {
	if (!DynLayer.set && !frame) DynLayerInit()
	this.frame = frame || self
	if (is.ns) {
		if (is.ns4) {
			if (!frame) {
				if (!nestref) {
					var nestref = DynLayer.nestRefArray[id];
				}
				if (!DynLayerTest(id,nestref)) {
					return;
				}
				this.css = (nestref)? eval("document."+nestref+".document."+id) : document.layers[id]
			}
			else {
				this.css = (nestref)? eval("frame.document."+nestref+".document."+id) : frame.document.layers[id]
			}
			this.elm = this.event = this.css;
			this.doc = this.css.document;
		}
		if (is.ns5) {
			this.elm = document.getElementById(id)
			this.css = this.elm.style
			this.doc = document
		}
		this.x = this.css.left
		this.y = this.css.top
		this.w = this.css.clip.width
		this.h = this.css.clip.height
	}
	else if (is.ie) {
		this.elm = this.event = this.frame.document.all[id]
		this.css = this.frame.document.all[id].style
		this.doc = document
		this.x = this.elm.offsetLeft
		this.y = this.elm.offsetTop
		this.w = (is.ie4)? this.css.pixelWidth : this.elm.offsetWidth
		this.h = (is.ie4)? this.css.pixelHeight : this.elm.offsetHeight
	}
	this.id = id
	this.nestref = nestref
	this.obj = id + "DynLayer"
	eval(this.obj + "=this")
}

function DynLayerMoveTo(x,y) {
	if (x!=null) {
		this.x = x
		if (is.ns) this.css.left = this.x
		else this.css.pixelLeft = this.x
	}
	if (y!=null) {
		this.y = y
		if (is.ns) this.css.top = this.y
		else this.css.pixelTop = this.y
	}
}
function DynLayerMoveBy(x,y) {
	this.moveTo(this.x+x,this.y+y)
}
function DynLayerShow() {
	this.css.visibility = (is.ns)? "show" : "visible"
}
function DynLayerHide() {
	this.css.visibility = (is.ns)? "hide" : "hidden"
}

if (parseInt(navigator.appVersion) >= 4) {
	DynLayer.prototype.moveTo = DynLayerMoveTo
	DynLayer.prototype.moveBy = DynLayerMoveBy
	DynLayer.prototype.show = DynLayerShow
	DynLayer.prototype.hide = DynLayerHide
	DynLayerTest = new Function('return true')
}

// DynLayerInit Function
function DynLayerInit(nestref) {
	if (!DynLayer.set) DynLayer.set = true
	if (is.ns) {
		if (nestref) ref = eval('document.'+nestref+'.document')
		else {nestref = ''; ref = document;}
		for (var i=0; i<ref.layers.length; i++) {
			var divname = ref.layers[i].name
			DynLayer.nestRefArray[divname] = nestref
			var index = divname.indexOf("Div")
			if (index > 0) {
				eval(divname.substr(0,index)+' = new DynLayer("'+divname+'","'+nestref+'")')
			}
			if (ref.layers[i].document.layers.length > 0) {
				DynLayer.refArray[DynLayer.refArray.length] = (nestref=='')? ref.layers[i].name : nestref+'.document.'+ref.layers[i].name
			}
		}
		if (DynLayer.refArray.i < DynLayer.refArray.length) {
			DynLayerInit(DynLayer.refArray[DynLayer.refArray.i++])
		}
	}
	else if (is.ie) {
		for (var i=0; i<document.all.tags("DIV").length; i++) {
			var divname = document.all.tags("DIV")[i].id
			var index = divname.indexOf("Div")
			if (index > 0) {
				eval(divname.substr(0,index)+' = new DynLayer("'+divname+'")')
			}
		}
	}
	return true
}
DynLayer.nestRefArray = new Array()
DynLayer.refArray = new Array()
DynLayer.refArray.i = 0
DynLayer.set = false

// BrowserCheck Object
function BrowserCheck() {
	var b = navigator.appName
	if (b=="Netscape") this.b = "ns"
	else if (b=="Microsoft Internet Explorer") this.b = "ie"
	else this.b = b
	this.version = navigator.appVersion
	this.v = parseInt(this.version)
	this.ns = (this.b=="ns" && this.v>=4)
	this.ns4 = (this.b=="ns" && this.v==4)
	this.ns5 = (this.b=="ns" && this.v==5)
	this.ie = (this.b=="ie" && this.v>=4)
	this.ie4 = (this.version.indexOf('MSIE 4')>0)
	this.ie5 = (this.version.indexOf('MSIE 5')>0)
	this.min = (this.ns||this.ie)
}
is = new BrowserCheck()

// CSS Function
function css(id,left,top,width,height,color,vis,z,other) {
	if (id=="START") return '<STYLE TYPE="text/css">\n'
	else if (id=="END") return '</STYLE>'
	var str = (left!=null && top!=null)? '#'+id+' {position:absolute; left:'+left+'px; top:'+top+'px;' : '#'+id+' {position:relative;'
	if (arguments.length>=4 && width!=null) str += ' width:'+width+'px;'
	if (arguments.length>=5 && height!=null) {
		str += ' height:'+height+'px;'
		if (arguments.length<9 || other.indexOf('clip')==-1) str += ' clip:rect(0px '+width+'px '+height+'px 0px);'
	}
	if (arguments.length>=6 && color!=null) str += (is.ns)? ' layer-background-color:'+color+';' : ' background-color:'+color+';'
	if (arguments.length>=7 && vis!=null) str += ' visibility:'+vis+';'
	if (arguments.length>=8 && z!=null) str += ' z-index:'+z+';'
	if (arguments.length==9 && other!=null) str += ' '+other
	str += '}\n'
	return str
}
function writeCSS(str,showAlert) {
	str = css('START')+str+css('END')
	document.write(str)
	if (showAlert) alert(str)
}

function NewsTicker(x,y,width,height) {
	this.name = 'NewsTicker'+(NewsTicker.count++)
	this.x = x
	this.y = y
	this.w = width
	this.h = height
	this.obj = this.name + "Object"
	eval(this.obj + "=this")
	this.items = new Array()
	this.scrollCount = 0

	this.pauseLength = 3000	
	this.inc = 2
	this.speed = 30
	this.fromX = 0
	this.fromY = this.h
	this.bgColor = null

	this.addItem = NewsTickerAddItem
	this.activate = NewsTickerActivate
	this.build = NewsTickerBuild
	this.start = NewsTickerStart
	this.stop = NewsTickerStop
	this.slide = NewsTickerSlide
}
function NewsTickerAddItem(text) {
	var i = this.items.length
	this.items[i] = new Object()
	this.items[i].text = text
}
function NewsTickerBuild() {
	this.css = css(this.name,this.x,this.y,this.w,this.h)
	this.div = '<div id="'+this.name+'">'
	for (var i=0;i<this.items.length;i++) {
		this.css += css(this.name+'Item'+i,0,0,this.w,this.h,this.bgColor,'hidden')
		this.div += '<div id="'+this.name+'Item'+i+'">'+this.items[i].text+'</div>'
	}
	this.div += '</div>'
}
function NewsTickerActivate(autostart) {
	for (var i=0;i<this.items.length;i++) {
		this.items[i].lyr = new DynLayer(this.name+'Item'+i)
		this.items[i].lyr.moveTo(this.fromX,this.fromY)
		this.items[i].lyr.show()
	}
	this.items[0].lyr.moveTo(0,0)
	this.lyr = new DynLayer(this.name)
	var num = Math.sqrt(Math.pow(this.fromX,2) + Math.pow(this.fromY,2))/this.inc
	this.dx = this.fromX/num || 0
	this.dy = this.fromY/num || 0
	if (autostart!=false) setTimeout(this.obj+'.start()',this.pauseLength)
}
function NewsTickerStart() {
	if (!this.started) {
	this.started = true
	var t = this.scrollCount
	var b = (this.scrollCount==this.items.length-1)? 0 : this.scrollCount+1
	var obj1 = this.items[t].lyr.obj
	var obj2 = this.items[b].lyr.obj
	this.timer = setInterval(this.obj+'.slide('+obj1+','+obj2+')',this.speed)
	}
}
function NewsTickerStop() {
	clearInterval(this.timer)
	this.started = false
}
function NewsTickerSlide(obj1,obj2) {
	obj1.moveBy(-this.dx,-this.dy)
	obj2.moveBy(-this.dx,-this.dy)
	if ((this.dx!=0 && Math.floor(obj2.x)==0) || (this.dy!=0 && Math.floor(obj2.y)==0)) {
		clearInterval(this.timer)
		obj1.moveTo(this.fromX,this.fromY)
		obj2.moveTo(0,0)
		this.scrollCount = (this.scrollCount==this.items.length-1)? 0 : this.scrollCount+1
		this.timer = setTimeout(this.obj+'.started=false;'+this.obj+'.start()',this.pauseLength)
	}
}
NewsTicker.count = 0