var ImageSrc = ['aboutus','history','europeanboard','programmes','documents','links','supporters'];
var limiter = "_up";
var filetype = ".gif";
var filedir = "img/"
var ImageArray = new Array();
var loaded = false;

function init(){
	var tmp, tmp_up;
	for(var i=0; i < ImageSrc.length; i++){
		tmp = new Image();
		tmp.src = filedir + ImageSrc[i] + filetype;	
		tmp_up = new Image();	
		tmp_up.src = filedir + ImageSrc[i] + limiter + filetype;	
		ImageArray[i] = [tmp, tmp_up];
	}
	loaded = true;
	
}
function ImgReplace(aID, aIndex) {
	if(!loaded) return;
	document.images["Image" + aID].src = ImageArray[aID][aIndex].src;
}