Hello, I have a random image in my website but it can work for background
here is the code:
PHP Code:
$random_bg=rand(1,23);
ECHO "<BODY STYLE=\"BACKGROUND-IMAGE:URL(http://yourwebsite.com/background_{$random_bg}.jpg);\">";
Basically, you name all your backgrounds
background_1.jpg
background_2.jpg
change the 23 in rand(1,23); to wahtever max images you have. if you have 10, then chagne it to rand(1,10);
then u just change the URL.