//Manipulation of griphics
//
// Created by Eric Poon, www.bigbeams.com
//
// Copyright by Eric Poon (POON TIT - Ming), July 2000

var img_ie4 = (navigator.appName == 'Microsoft Internet Explorer')? true:false;
var img_ns4 = (navigator.appName == 'Netscape')? true:false;

function preloadImg(imgObj,imgSrc)
{
	if (document.images) 
	{
		eval(imgObj+' = new Image()');
		eval(imgObj+'.src = "'+imgSrc+'"');
	}
}

function changeImg(layer,imgName,imgObj)
{
	if (img_ns4 && layer!=null)
		eval('document.'+layer+'.document.images["'+imgName+'"].src = '+imgObj+'.src');
	else document.images[imgName].src = eval(imgObj+".src");
}