<?php
 
 
$imagenum = rand(1,3);
if (($imagenum == 1)) {
    //Display Image #1 Here
    echo "<img src='http://website.net/Bild1.jpg'>";
 
 
}
elseif (($imagenum == 2)) {
    //Display Image #2 Here
    echo "<img src='http://website.net/Bild2.jpg'>";
 
}
elseif (($imagenum == 3)) {
    //Display Image #3 Here
    echo "<img src='http://website.net/Bild3.jpg'>";
 
}
else {
    //Display Image Here
    echo "<img src='http://website.net/Bild4.jpg'>";
 
}
?>

body {
cursor: url('https://website.de/maus1.png') 0 0, auto;
}

input[type="submit"], text, a {
cursor: url('https://website.de/maus2.png') 0 0, auto;
}