var bildnummer = 11;
var zufall = Math.random();
var bildselect = Math.round((bildnummer -1)*zufall)+1;
if(bildselect==1) {
document.write("<img src=\"f1.jpg\"  width=\"400\" height=\"300\">");
}
if(bildselect==2) {
document.write("<img src=\"f2.jpg\"  width=\"400\" height=\"300\">");
}
if(bildselect==3) {
document.write("<img src=\"f3.jpg\"  width=\"400\" height=\"300\">");
}
if(bildselect==4) {
document.write("<img src=\"f4.jpg\"  width=\"400\" height=\"300\">");
}
if(bildselect==5) {
document.write("<img src=\"f5.jpg\"  width=\"400\" height=\"300\">");
}
if(bildselect==6) {
document.write("<img src=\"f6.jpg\"  width=\"400\" height=\"300\">");
}
if(bildselect==7) {
document.write("<img src=\"f7.jpg\"  width=\"400\" height=\"300\">");
}
if(bildselect==8) {
document.write("<img src=\"f8.jpg\"  width=\"400\" height=\"300\">");
}
if(bildselect==9) {
document.write("<img src=\"f9.jpg\"  width=\"400\" height=\"300\">");
}
if(bildselect==10) {
document.write("<img src=\"f10.jpg\"  width=\"400\" height=\"300\">");
}
if(bildselect==11) {
document.write("<img src=\"f11.jpg\"  width=\"400\" height=\"300\">");
}