var autoSlideTimeout = null;
var currSlide = 1;
var numSlides = 4;

function toggleSlide(n)
{

	try{
	toggleLayer("slide_1", false);
	toggleLayer("slide_2", false);
	toggleLayer("slide_3", false);
	toggleLayer("slide_4", false);
	toggleLayer("slide_5", false);
	toggleLayer("slide_6", false);
	} catch (e) {}
	
	toggleLayer("slide_"+n, true);
	currSlide = n;
	
	try{ clearTimeout(autoSlideTimeout); } catch(e) {}
	autoSlideTimeout = setTimeout("autoAdvanceSlide()", 8 * 1000);
}

function autoAdvanceSlide()
{

	currSlide += 1
	if( currSlide > numSlides ) currSlide = 1;
	
	toggleSlide(currSlide);
}

autoSlideTimeout = setTimeout("autoAdvanceSlide()", 8 * 1000);