var popupWindow=null;

function help(mypage){
w='400';h='300';myname='name';
LeftPosition=(screen.width)?(screen.width-w)/2:100;
TopPosition=(screen.height)?(screen.height-h)/2:00;
TopPosition='300';
settings='width='+ w + ',height='+ h + ',top=' + TopPosition + ',left=' + LeftPosition + ',scrollbars=yes,location=no,directories=no,status=no,menubar=no,toolbar=no,resizable=yes';
popupWindow=window.open(mypage,myname,settings);
popupWindow.focus();popupWindow.location=mypage;

}