function togglePhoto(URL) {
	diashow_stop();
	document.getElementById("mainphoto").src = URL;
}

//configure the speed of the slideshow, in miliseconds
var slideshowspeed=3000;
var whichimage=0;
var dia_loopt=0;

function diashow_start_stop(speed) {
	if (dia_loopt==0)
	diashow_start(speed);
	else
	diashow_stop();	
}

function diashow_start(speed) {
	if (document.getElementById('diashow_tekst')){
		document.getElementById('diashow_tekst').innerHTML="diashow ("+slideshowspeed/1000+" sec./foto) stoppen";
		//document.getElementById('diashow_tekst').innerHTML="diashow wordt weergegeven ("+slideshowspeed/1000+" s./foto)";
	}
	slideshowspeed=speed;
	dia_loopt=1;
	diashow();
}

function diashow_stop() {
	if (dia_loopt==1) {
		dia_loopt=0;
		if (document.getElementById('diashow_tekst')) {
			document.getElementById('diashow_tekst').innerHTML="alle foto's als diashow weergeven";}
		}
	}

	function diashow() {
		if (dia_loopt==1) {
		  	if (!document.images)
		    return;
    		document.images.mainphoto.src=fotos[whichimage].src;
			if (whichimage<fotos.length-1)
		    whichimage++;
		  	else
		    whichimage=0;
  			fTimer=setTimeout("diashow()",slideshowspeed);
		}
		else {
			return;
		}
	}