function shownewsletter(url){
	var w=370;
	var h=320;
	var s=0;
	var l=(screen.width-w)/2;
	var t=(screen.height-h)/2;
	if(window.thiswin != undefined){
		thiswin.close();
	}
	thiswin = window.open(url,"newsletter",'toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars='+s+',resizable=0,width='+w+',height='+h+',left='+l+',top='+t);
}