function backnumberOpen(){
var win;
win=window.open("http://www.nature-n.com/backnumber/frameset.html","backnumber","toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=no,width=509,height=480");
win.focus();
}

function winClose(){
	parent.close();
}

function ctrlWin(url){
	Pwin = window.top.opener.top;
	Pwin.location.href=url;
	window.parent.close();
}