//ProtoLayer v4
//11th September 2003
//karl@core10.co.uk
var bT = navigator.appName
var b
if (bT=="Netscape") b = "ns"
else if (bT=="Microsoft Internet Explorer") b = "ie"
else b=bT
var version = navigator.appVersion
var v = parseInt(version)
var ns = b=="ns" && v>=4
var ns4 = b=="ns" && v==4
var ns5 = b=="ns" && v>=5
var ie = b=="ie" && v>=4
var ie4 = version.indexOf('MSIE 4')>0
var ie5 = version.indexOf('MSIE 5')>0
var ie6 = version.indexOf('MSIE 6')>0
var isMac = (navigator.appVersion.indexOf("Mac") != -1);
var isDom = document.getElementById;
var ns7=navigator.userAgent.indexOf('Netscape/7')>0;

function addObj(){
	var id=this.name||this.id
	if(id){
		document.all[id]=this
		eval(id+"=this")
		if(this.src)preloadRoll(this)
	}
}

function getProtoLayer(id,parElm){
	if(document.getElementById(id)){
		if(!eval('typeof '+id+'Div=="object"'))eval(id+'Div=new ProtoLayer(id,parElm)');
		return eval(id+'Div');
	}
}

function ProtoLayer(id,parElm) {
	this.id = id
	var t = this.ref = document.getElementById(id)
	this.css = t.style
	this.doc = document
	this.x = t.offsetLeft
	this.y = t.offsetTop
	this.w = ie4 ? this.css.pixelWidth : t.offsetWidth
	this.h = ie4 ? this.css.pixelHeight : t.offsetHeight
	var parId=this.ref.offsetParent.id
	this.parElm=parId ? getProtoLayer(parId) : document
	this.obj = id + "ProtoLayer"
	eval(this.obj + "=this")
}

function ProtoLayerInit() {
	spiderLayers(document.getElementsByTagName("div"))
	var allImg=document.getElementsByTagName("img")
	for(var i=0;i<allImg.length;i++)if(allImg[i].id)preloadRoll(allImg[i]);
}

function spiderLayers(layRef){
	var arrLen=layRef.length;
	for(var i=0;i<arrLen;i++){
		var divname = layRef[i].id
		if(divname&&!(eval('typeof '+divname+'Div=="object"')))eval(divname+'Div = new ProtoLayer(divname,layRef)')
	}
}

function ProtoLayerShow() {
	this.css.visibility = "visible"
}

function ProtoLayerHide() {
	this.css.visibility = "hidden"
}

function ProtoLayerInherit() {
	this.css.visibility="inherit";
}

ProtoLayer.prototype.show = ProtoLayerShow
ProtoLayer.prototype.hide = ProtoLayerHide
ProtoLayer.prototype.inherit = ProtoLayerInherit

function ProtoLayerWrite(html) {
	this.ref.innerHTML = html
}
ProtoLayer.prototype.write = ProtoLayerWrite

function preloadRoll(obj){
	obj.rollOn=new Image(obj.width,obj.height)
	obj.rollOff=new Image(obj.width,obj.height)
	obj.rollOn.src=obj.src.replace(/off.gif/,'on.gif')
	obj.rollOff.src=obj.src.replace(/on.gif/,'off.gif')
}

function roll(imgObj,imgSrc){
	var elm=document.getElementById(imgObj)
	if (elm){
		if(!elm.rollOn)preloadRoll(eval(imgObj))
		if(imgSrc.indexOf('roll')==0)imgSrc=eval("elm."+imgSrc+".src")
		elm.src=imgSrc
	}
}