var imagenum = 1;		// first image (actual image in fact)
var imagemax = 2;		// last image
var imagepos = 0;		// in opacity %
var imagestep = 0.024;		// in opacity %
var imagespeed = 50;	// in msec
var imagesleep = 3000;	// in msec

var firstimage = 0;
var nextimage = 0;

function stepforwardopc() {
	imagepos += imagestep;
	if (imagepos > 1) imagepos = 1;
	if (firstimage == 0) firstimage = document.getElementById("photo"+imagenum);
	if (nextimage == 0) {
		i = imagenum+1;
		if (i > imagemax) i = 1;
		nextimage = document.getElementById("photo"+i);
		nextimage.style.display = '';
	}
	imageposinverted = 1-imagepos
	if (firstimage.filters) firstimage.style.filter = 'alpha(opacity='+(imageposinverted*100)+')'; else firstimage.style.opacity = imageposinverted;
	if (nextimage.filters) nextimage.style.filter = 'alpha(opacity='+(imagepos*100)+')'; else nextimage.style.opacity = imagepos;
	if (imagepos == 1) {
		imagenum++;
		if (imagenum > imagemax) imagenum = 1;
		firstimage = 0; nextimage = 0;
		imagepos = 0;
		window.setTimeout("stepforwardopc()",imagesleep);
	} else window.setTimeout("stepforwardopc()",imagespeed);
}