window.onload = choosePic;

var myPix = new Array("pieces/0001.jpg","pieces/0002.jpg","pieces/0003.jpg","pieces/0004.jpg","pieces/0005.jpg","pieces/0006.jpg","pieces/0007.jpg","pieces/0008.jpg","pieces/0009.jpg","pieces/0010.jpg");

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