=> name all header images with prefix of headerimage_

=> insert this code into header.php

“<img src=”http://pathtoimages/headerimage_
<? php echo (rand(1,3).jpg”
width=”image_width” height=”image_height”
alt=”image_alt_text”?>”

=> all images have to be sized the same & in the same format

=> in the code: rand(1,3)
the second number equals the total number of images