Random starting slideshow

Someone can help me to do a slideshow on my div background ? slideshow need to start with a random image from 20 slider images from the folder. Is there any solution for that ? I am very new in web design, so kindly help ?? my site link given below

http://goo.gl/OPDIbt

Randomize Resizeable Background Images

Hello.

I have been asked to create a login screen with two effects:
resizeable image (image that stretches to always fill the screen)
randomized background images

I have successfully coded the stretch-able background image with:

html:

Css:
img.bg {
height: auto;
left: 0;
min-height: 100%;
min-width: 1024px;
position: fixed;
top: 0;
width: 100%;
}

However, I can't figure out how to also randomize the background image as most methods use php.

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