var winObj = null;
function openGuestbook(){
	var winW=550;
	var winH=600;
	var winX=0;
	var winY=0;
	if(screen.availWidth && screen.availHeight){
		winX = (screen.availWidth/2)-(winW/2);
		winY = (screen.availHeight/2)-(winH/2);
	}
	if (winObj && !winObj.closed) winObj.close();
	winObj = window.open("guestbook.asp","dept_guestbook","width="+winW+",height="+winH+",left="+winX+",top="+winY+",scrollbars=yes");
	winObj.focus();
}