var kop = new Array()

kop[0] = '../images/hansgrietje/layout/titel_logo_01.jpg'
kop[1] = '../images/hansgrietje/layout/titel_logo_02.jpg'
kop[2] = '../images/hansgrietje/layout/titel_logo_03.jpg'
kop[3] = '../images/hansgrietje/layout/titel_logo_04.jpg'
kop[4] = '../images/hansgrietje/layout/titel_logo_05.jpg'
kop[5] = '../images/hansgrietje/layout/titel_logo_06.jpg'
kop[6] = '../images/hansgrietje/layout/titel_logo_07.jpg'

var j = 0
var p = kop.length;

var preBuffer = new Array()
for (i = 0; i < p; i++){
   preBuffer[i] = new Image()
   preBuffer[i].src = kop[i]
}

var whichImage = Math.round(Math.random()*(p-1));
function showImage(){
document.write('<img src="'+kop[whichImage]+'">');
}