var photos = [ {
		"image" : "nt1.jpg"
	}, {
		"image" : "nt2.jpg"
	}, {
		"image" : "nt3.jpg"
	}, {
		"image" : "nt4.jpg"
	}, {
		"image" : "nt5.jpg"
	}, {
		"image" : "nt6.jpg"
	}
];

$(document).ready(function() {
		
	var showImage = function() {
		var currentImg = 0;
		ran_number=Math.floor(Math.random()*photos.length); 
		currentImg = ran_number;
		$("#headerimg").css({
			"background-image" : "url(http://www.netwerk-twente.nl/img/" + photos[currentImg].image + ")"
		});		
	};
	showImage();
});