var theImages = new Array();

theImages[0] = 'fotoshow01.jpg';
theImages[1] = 'fotoshow02.jpg';
theImages[2] = 'fotoshow03.jpg';
theImages[3] = 'fotoshow04.jpg';
theImages[4] = 'fotoshow05.jpg';
theImages[5] = 'fotoshow06.jpg';
theImages[6] = 'fotoshow07.jpg';
theImages[7] = 'fotoshow08.jpg';
theImages[8] = 'fotoshow09.jpg';
theImages[9] = 'fotoshow10.jpg';
theImages[10] = 'fotoshow11.jpg';
theImages[11] = 'fotoshow12.jpg';
theImages[12] = 'fotoshow13.jpg';
theImages[13] = 'fotoshow14.jpg';
theImages[14] = 'fotoshow15.jpg';
theImages[15] = 'fotoshow16.jpg';
theImages[16] = 'fotoshow17.jpg';
theImages[17] = 'fotoshow18.jpg';
theImages[18] = 'fotoshow19.jpg';
theImages[19] = 'fotoshow20.jpg';
theImages[20] = 'fotoshow21.jpg';

var p = theImages.length;
var whichImage = Math.round(Math.random()*(p-1));

function showImage() {
	document.getElementById('leftFotoBox').style.backgroundImage = 'url("fotoshow/'+theImages[whichImage]+'")';
}