var arrImg=new Array();
var AgntUsr=navigator.userAgent.toLowerCase();
var DomYes=document.getElementById?1:0;
var NavYes=AgntUsr.indexOf('mozilla')!=-1&&AgntUsr.indexOf('compatible')==-1?1:0;
var ExpYes=AgntUsr.indexOf('msie')!=-1?1:0;
var Opr=AgntUsr.indexOf('opera')!=-1?1:0;
var Nav4=(NavYes && !DomYes);
var IE4=((document.all?1:0) && !DomYes);



function mImg(anm,aSrc){
this.nm=anm;
this.img=new Image();
this.img.src=aSrc;}

function getImg(nm){

if (document.images[nm]) return document.images[nm];
if (document.layers) {var tmp=reclay(document.layers,nm);return tmp;}}

function reclay(alay,anm){
for (var c=0;c<alay.length;c++){
	if (alay[c].document[anm]) {
		return alay[c].document[anm];}
	var tmp = reclay(alay[c].layers,anm);
	if (tmp!=null) return tmp;}	
return null;}


function preloadImg(anm,aSrc){
arrImg[arrImg.length]=new mImg(anm,aSrc);}

function getImgArr(aImgNm){
for (var c=0;c<arrImg.length;c++){
	if (arrImg[c].nm==aImgNm) return arrImg[c].img;}
return null;}

function rollover(anm,aImgNm){
var imDs=getImg(anm);
var imSr=getImgArr(aImgNm);
if (!((imSr==null) || (imDs==null)))
	imDs.src=imSr.src;}