var win=null;
function launch(mypage)
{
	w=600;
	h=400;
	LeftPosition=(screen.width)?(screen.width-w)/2:100;
	TopPosition=(screen.height)?(screen.height-h)/2:100;
	settings='width='+w+',height='+h+',top='+TopPosition+',left='+LeftPosition+',scrollbars=no,location=no,directories=no,status=no,menubar=no,toolbar=no,resizable=no';
	win=window.open(mypage,"tour",settings);
}