var PictureNewsletter = new Array(); // don't change this

PictureNewsletter[1]  = 'images/new/newsletter1.jpg';
PictureNewsletter[2]  = 'images/new/newsletter2.jpg';
PictureNewsletter[3]  = 'images/new/newsletter3.jpg';
PictureNewsletter[4]  = 'images/new/newsletter4.jpg';
PictureNewsletter[5]  = 'images/new/newsletter5.jpg';
PictureNewsletter[6]  = 'images/new/newsletter6.jpg';


var cur = 1;
var pl = PictureNewsletter.length - 1;

var preLoadNewsletter = new Array();
for(i = 1; i < pl + 1; i++){
	preLoadNewsletter[i] = new Image();
	preLoadNewsletter[i].src = PictureNewsletter[i];
}

function changePicture(){
	cur++;
	if(cur > pl){
		cur = 1;
	}
	document.images.PictureNewsletter.src = preLoadNewsletter[cur].src;
}