function publishPicture(i) {
// Specify number of milliseconds between image switches.
var switchMilliseconds = 6000;
//   background image to switch.
var divID = 'slide';
document.getElementById(divID).style.background = 'url("'+imageArray[i]+'")';
i++;
if( i > (imageArray.length - 1) ) { i = 0; }
setTimeout('publishPicture('+i+')',switchMilliseconds);
}