var timeDelay = 20; 
var Pix = new Array
("images/1.jpg"
,"images/2.jpg"
,"images/3.jpg"
,"images/4.jpg"
);
var howMany = Pix.length;

timeDelay *= 250;

var PicCurrentNum = 0;

var PicCurrent = new Image();

PicCurrent.src = Pix[PicCurrentNum];

function startPix() {

	setInterval("slideshow()", timeDelay);

}
function slideshow() {

	PicCurrentNum++;
	if (PicCurrentNum == howMany) {

		PicCurrentNum = 0;
	}
	PicCurrent.src = Pix[PicCurrentNum];
	document["ChangingPix"].src = PicCurrent.src;
}