var thispic = 0;
var displayPause = 5000;
var displaySpeed = 50;

function fadeOut(which)
{
	var what;
	for (i=1; i<=10; i++)
	{
		what = 100 - (i * 10);
		setTimeout('changeOpac(\"'+which+'\",'+what+')',i*displaySpeed);
	}
}

function fadeIn(which)
{
	var what;
	for (i=1; i<=10; i++)
	{
		what = i * 10;
		setTimeout('changeOpac(\"'+which+'\",'+what+')',i*displaySpeed);
	}
}

function changeOpac(which,what)
{
	document.getElementById(which).className = 'opacity' + what;
}

function runSlideShow()
{
	lastpic = thispic;
	nextpic = thispic + 1;
	if (nextpic > ssNum - 1)
	{
		nextpic = 0;
	}
	thispic = nextpic;

	fadeOut('slideshow_'+lastpic);
	fadeIn('slideshow_'+nextpic);
}

setInterval('runSlideShow()', displayPause);