function set_pos(){
var x = screen.width;
var y = Math.round((x-780)/2);
if (y < 0){
y = 0;
}
//hide the wrapper until it gets positioned
document.getElementById('wrapper').style.visibility="hidden";
document.getElementById('wrapper').style.position="absolute";
document.getElementById('wrapper').style.top = 0;
document.getElementById('wrapper').style.left = y;
//now show the wrapper
document.getElementById('wrapper').style.visibility="visible";
document.getElementById('wrapper').style.display="block";
document.getElementById('main-menu-div').style.position = "absolute";
document.getElementById('main-menu-div').style.top = 75;
document.getElementById('main-menu-div').style.left = y;
document.getElementById('museum-menu-div').style.position = "absolute";
document.getElementById('museum-menu-div').style.top = 75;
document.getElementById('museum-menu-div').style.left = y + 130;
document.getElementById('house-menu-div').style.position = "absolute";
document.getElementById('house-menu-div').style.top = 75;
document.getElementById('house-menu-div').style.left = y + 260;
document.getElementById('harcc-menu-div').style.position = "absolute";
document.getElementById('harcc-menu-div').style.top = 75;
document.getElementById('harcc-menu-div').style.left = y + 390;
}
function clear_menus()
{
document.getElementById('main_menu_div').style.visibility="hidden";
document.getElementById('main_menu_div').style.display="none";
document.getElementById('museum_menu_div').style.visibility="hidden";
document.getElementById('museum_menu_div').style.display="none";
document.getElementById('house_menu_div').style.visibility="hidden";
document.getElementById('house_menu_div').style.display="none";
document.getElementById('harcc_menu_div').style.visibility="hidden";
document.getElementById('harcc_menu_div').style.display="none";
}
function showmenu(elmnt)
{
set_pos();
document.getElementById(elmnt).style.display="block";
document.getElementById(elmnt).style.visibility="visible";
}
function hidemenu(elmnt)
{
set_pos();
document.getElementById(elmnt).style.display="none";
document.getElementById(elmnt).style.visibility="hidden";
}
function imageItem(image_location) {
		this.image_item = new Image();
		this.image_item.src = image_location;
}
	function get_ImageItemLocation(imageObj) {
		return(imageObj.image_item.src)
}
function randNum(x, y) {
		var range = y - x + 1;
		return Math.floor(Math.random() * range) + x;
}
function getNextImage() {
		if (random_display) {
			imageNum = randNum(0, totalImages-1);
		}
		else {
			imageNum = (imageNum+1) % totalImages;
    	}
var new_image = get_ImageItemLocation(imageArray[imageNum]);
	return(new_image);
}
function getPrevImage() {
		imageNum = (imageNum-1) % totalImages;
		var new_image = get_ImageItemLocation(imageArray[imageNum]);
		return(new_image);
}
function prevImage(place) {
		var new_image = getPrevImage();
		document[place].src = new_image;
}
function switchImage(place) {
		var new_image = getNextImage();
		document[place].src = new_image;
		var recur_call = "switchImage('"+place+"')";
		timerID = setTimeout(recur_call, interval);
}
function product_highlight(image){
window.open("detail.php?image","_blank","toolbar=yes, location=yes, directories=no, status=no, menubar=yes, scrollbars=yes, resizable=no, copyhistory=yes, width=400, height=400");	
	
}