var win = null;

function NewWindow(mypage,myname)

{
LeftPosition = (screen.width) ? (screen.width-525)/2 : 0;
TopPosition = (screen.height) ? (screen.height-675)/2 : 0;

settings =

'height=675,width=525,top='+TopPosition+',left='+LeftPosition+',directories=no,status=no,menubar=no,scrollbars=0,resizable=0'

win = window.open(mypage,myname,settings); win.focus();

}