//code for menus
function reveal(menu)
{

var m1 = document.getElementById("menu_1");
var m2 = document.getElementById("menu_2");
var m3 = document.getElementById("menu_3");
var m4 = document.getElementById("menu_4");


	if(menu == 1) m1.style.visibility = "visible";
	if(menu == 2) m2.style.visibility = "visible";
	if(menu == 3) m3.style.visibility = "visible";
	if(menu == 4) m4.style.visibility = "visible";
	if(menu == 5) m5.style.visibility = "visible";
	if(menu !== 1) m1.style.visibility = "hidden";
	if(menu !== 2) m2.style.visibility = "hidden";
	if(menu !== 3) m3.style.visibility = "hidden";
	if(menu !== 4) m4.style.visibility = "hidden";
	
}

function hide()
{

var m1 = document.getElementById("menu_1");
var m2 = document.getElementById("menu_2");
var m3 = document.getElementById("menu_3");
var m4 = document.getElementById("menu_4");

m1.style.visibility = "hidden";
m2.style.visibility = "hidden";
m3.style.visibility = "hidden";
m4.style.visibility = "hidden";

}
//code for picture's rollover on home page
function change(img_name,img_src) {
document[img_name].src=img_src;
}
//code for rotating picture on home page
			var timer;
			var pause = 150;
			var n = 0;
			var imgs = new Array ("images/jigsaw/map4.jpg","images/jigsaw/map5.jpg","images/jigsaw/map6.jpg","images/jigsaw/map8.jpg","images/jigsaw/map7.jpg","images/jigsaw/map4.jpg");
			var preload = new Array();
			for(var i = 1; i<imgs.length; i++)
				{
				preload[i] = new Image();
				preload[i].src = imgs[i];
				}
			function rotate()
			{
				document.images.main.src = imgs[n];
				(n == (imgs.length -1)) ? n=0 : n++;
				timer = window.setTimeout("rotate();", pause);
				
				if(n<=0){
					stop();
				}
			}
			function stop()
{
	clearTimeout(timer);
}