// The images being called must be in a folder named "images".
// their name must be "front" followed by a number.

function randPhoto() {
	var numPhotos=12;  //Adjust to number of images in your folder.
	var rnd= (Math.floor(Math.random()*numPhotos)+1);
	document.write('<img src="images/front'+rnd+'.jpg" alt="image"/>');			
	}