var win = null;

function NewWindow(mypage,myname,w,h,scrollbar,resi){

LeftPosition = (screen.width-w)/2

TopPosition = (screen.height-h)/2 

settings =

'height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+scrollbar+',resizable='+resi+''

window.open(mypage,myname,settings)

}