var win = null;
function pop(mypage,myname,w,h){
LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
settings = 'height='+h+',width='+w+',top='+TopPosition+
',left='+LeftPosition+',status=no,scrollbars=no,resizable=no'
win = window.open(mypage,myname,settings)
}