var numHorz = 19;
var numVert = 6;
var numPhotos = numHorz + numVert;

function randomphoto() {
	var img = document.getElementById("randomimage");
	var num = Math.round(Math.random() * numPhotos);
	if(num <= numHorz) {
		img.width = 300
		img.height = 200;
		img.src = "random/random" + num + ".jpg";
	} else {
		img.width = 200
		img.height = 300;
		num -= numHorz;
		img.src = "random/v-random" + num + ".jpg";
	}
}