window.onload = function RandomHeaderImages() {
var header = document.getElementById('header');
var pictures = new Array();
pictures[0] = '/Portals/3/Skins/MPS/headers_home/bloem1.jpg';
pictures[1] = '/Portals/3/Skins/MPS/headers_home/geleroos.jpg';
pictures[2] = '/Portals/3/Skins/MPS/headers_home/lieveheerstbeest1.jpg';
pictures[3] = '/Portals/3/Skins/MPS/headers_home/lieveheerstbeest2.jpg';
pictures[4] = '/Portals/3/Skins/MPS/headers_home/header_tomaat.jpg';
pictures[5] = '/Portals/3/Skins/MPS/headers_home/veiling_motion.jpg';
pictures[6] = '/Portals/3/Skins/MPS/headers_home/zonnebloem1.jpg';
pictures[7] = '/Portals/3/Skins/MPS/headers_home/gerbera.jpg';
pictures[8] = '/Portals/3/Skins/MPS/headers_home/orchidee.jpg';
pictures[9] = '/Portals/3/Skins/MPS/headers_home/vleeseter.jpg';

var numPics = pictures.length;

if (document.images) {
	var chosenPic = Math.floor((Math.random() * numPics));
	header.style.background = 'url(' + pictures[chosenPic] + ')';
	header.style.backgroundRepeat = 'no-repeat';
	/*header.style.display = 'block';
	obj.style.display = 'block' 
	*/
	}
}
RandomHeaderImages();