//random image generator from Danny Goodman's O'Reilly book
var picit = new Array();
picit[picit.length] = {src:"graphics/hm/HKskyline.jpg"};
picit[picit.length] = {src:"graphics/hm/blur-umbrellas.jpg"};
picit[picit.length] = {src:"graphics/hm/looking-up.jpg"};
picit[picit.length] = {src:"graphics/hm/blueMap.jpg"};
picit[picit.length] = {src:"graphics/hm/china-busy-street.jpg"};
function getRandomImage() {
	var currIndex = Math.floor(Math.random() * (picit.length));
	var output = "<img src='" + picit[currIndex].src;
	output += "' name='slide' />";
	return output;
}