function randomPhoto() {
	
	var gblPhotoDivId = "rotatingimage-inner";
	var gblImg = new Array(
	"images/inner/masthead/1.jpg",
	"images/inner/masthead/2.jpg",
	"images/inner/masthead/3.jpg",
	"images/inner/masthead/4.jpg",
	"images/inner/masthead/5.jpg"
	);
	
	var gblDeckSize = gblImg.length;
	var gblOnDeck = 0;
	var thediv = document.getElementById(gblPhotoDivId);
    	
	var rand_no = Math.ceil(gblDeckSize*Math.random())


    // change CSS
    thediv.style.backgroundImage='url(' + gblImg[rand_no-1] + ')';
    
}