Javascript random images?

I want to make a script that will display 4 random images at a time, with none of the being the same ie:
:cool :cry
not:
:cool :cry :cool

I have looked all over and found guides for making 1 image show and be random but not more that 1

at the moment im using a 4 pic imagemap so people can click on the images and get a larger view.

what im aiming for is to have these 4 pictures be randomly chosen from X, not repeat in the same instance and be clickable to show larger/full image.

I could just make x number of 4 pic imagemaps and then randomise these, but this sucks and there must be a cleaner / eaiser way.

 

use an array and place the paths to the possible images in them.

then get 4 random numbers
then use the DOM to insert 4 new images into the page at the desired node.
make your life easy and use a JavaScript library like "X", "Prototype" or Scriptaculous.. heck even the MS Ajax library will be helpful.

 

Thanks for your suggestions Kodo I'll make good use of them