//number of photographs to select from...
var number_of_backgrounds = 1; 

var photograph_title = new Array(number_of_backgrounds);

photograph_title[0] = "St Andrews Castle ruins (photograph copyright by Gudmundur Andri Hjalmarsson)";


//random selection of heading photograph...
function randomHeading(){
		
	var photograph = document.getElementById('heading_photograph');
	
	var i = Math.round(Math.random()*(number_of_backgrounds-1));
	
	photograph.src = "graphic/headings/" + i + ".jpg";
	photograph.title = photograph_title[i];
}