/**
newwindowfocus checks first if the window has been already opened
used when opening the calculator
**/
function newwindowfocus(mypage,myname,w,h,scroll){

var winl = (screen.width-w)/2;
var wint = (screen.height-h)/2;
settings='height='+h+',width='+w+',top='+wint+',left='+winl+',scrollbars='+scroll+',toolbar=no,location=no,status=no,menubar=no,resizable=yes,dependent=no'
win=window.open(mypage,myname,settings)
if(parseInt(navigator.appVersion) >= 4){win.window.focus();}
}