window.onload = choosePic;

var myPix = new Array(
"images/generic/random_1.jpg",
"images/generic/random_2.jpg",
"images/generic/random_3.jpg",
"images/generic/random_4.jpg",
"images/generic/random_6.jpg",
"images/generic/random_7.jpg",
"images/generic/random_9.jpg",
"images/generic/random_10.jpg",
"images/generic/random_11.jpg",
"images/generic/random_12.jpg",
"images/generic/random_13.jpg",
"images/generic/random_14.jpg",
"images/generic/random_15.jpg",
"images/generic/random_16.jpg",
"images/generic/random_17.jpg",
"images/generic/random_18.jpg");

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