window.onload = choosePic;

var myPix = new Array("/media/cabeceras/01.jpg","/media/cabeceras/02.jpg","/media/cabeceras/03.jpg","/media/cabeceras/04.jpg","/media/cabeceras/04.jpg","/media/cabeceras/06.jpg");

function choosePic() {
	randomNum = Math.floor((Math.random() * myPix.length));
	document.getElementById("myPicture").src = myPix[randomNum];
}