function open_popup (url, width, height, center, newpopup) {
	var x = (width) ? width : '645';
	var y = (height) ? height : '500';
	var left = (screen.width-x) / 2;
	var top = (screen.height-y) / 2;
	var position = ((left > 0) && center) ? ',left='+left+',top='+top : '';
	var name = (newpopup) ? 'popup_'+rand() : 'popup';
	var popup = window.open(url, name, 'width='+x+'px,height='+y+'px,menubar=no,location=no,resizable=yes,scrollbars=yes,status=no'+position);
	popup.focus();
	return false;
}

function window_resize (e) {
	var box = e.document.getElementById ('popup_image');
	resizeTo(box.offsetWidth+30,box.offsetHeight+50);
	e.innerHeight = e.document.height+15;
}