function w(url){
	var ww=300,wh=600,pos;
	sw=screen.width;
	sh=screen.height;
	wbx=Math.round((sw-ww)/2);
	wby=Math.round((sh-wh)/2);
	pos="left="+wbx+",top="+wby+",";
	newWin=window.open(url,"sample",
	"width="+ww+",height="+wh+","+pos+
	"toolbar=no,"+
	"bar=no"+
	"location=no,"+
	"status=no,"+
	"menubar=no,"+
	"scrollbars=no,"+
	"resizable=0");
}