// duplicate the array of available images
var staticImg_array = imagePool_array.slice(0);

// randomizes the target images
function randomizePhotoboxes(targetIDs_array) {
	for (var i = 0; i < targetIDs_array.length; i++) {
		var randomNumber = Math.floor(Math.random() * (staticImg_array.length - 1));
		if (document.getElementById(targetIDs_array[i]).src) {
			document.getElementById(targetIDs_array[i]).src = staticImg_array.splice(randomNumber, 1)[0];
		}
	}
}