/*
	Pop-up window with variable width / height, centered on screen
	Usage:
		<a href="link" onclick="popup('photo',widthpx,heightpx)" target="photo" title="title"><img src="image" alt="text" /></a>
*/
var win = null;
function popup(n,w,h){
	LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
	TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
	settings = 'height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',scrollbars=no,toolbar=no,resizable=no';
	win = window.open("",n,settings);
}