What ?
Here I will explain How to change the background image of the page dynamically by using CSS and JavaScript
Explanation :
Below example i have taken 3 sample images for background slide, change that image paths according to your system paths.
imgs[0]="images/Sunset.jpg"; imgs[1]="images/Bluehills.jpg"; imgs[2]="images/Sunset.jpg";
Save the below code as "Slide.html" and test it.......