var w;
	
	function OWin(url, w, h) {
		var left = (screen.availWidth - w) / 2;
		var top = (screen.availHeight - h) / 4;
		w = window.open(url, 'popup', 'width=' + w + ',height=' + h + ',left=' + left + ',top=' + top + ',history=no,toolbar=no,status=no,scrollbars=yes,resizable=yes');
		w.focus();
		return;
	}
	
	function confirm_action(url){ 
		if (confirm("Are you sure you want to do this?")) {
			window.location = url;
		}
		return;
	}