var number = 1;
var count = 4;
var topfotos = new Array();
topfotos[0] = "musicpic1.jpg";
topfotos[1] = "musicpic2.jpg";
topfotos[2] = "musicpic3.jpg";
topfotos[3] = "musicpic4.jpg";

function swapPicture ()
{
	number = number + 1;
	if (number >= count)
		number = 0;

	var image = new Image();
  	image.src = 'http://www.wegmetdegevelkerstman.be/pics/' + topfotos[number];

	document.getElementById("musicpic").src = image.src;
   	setTimeout("swapPicture()",3000);
}

setTimeout("swapPicture()",3000);