window.onload = choosePic;

var myPix = new Array("images/sub_right01.jpg","images/sub_right02.jpg","images/sub_right03.jpg","images/sub_right04.jpg","images/sub_right05.jpg","images/sub_right06.jpg");

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