function NewWindow(mypage, myname, w, h, scroll,resize) {
    var winl = (screen.width - w) / 2;
    var wint = (screen.height - h) / 2;
    winprops = 'height='+h+',width='+w+',top='+wint+',left='+winl+',scrollbars='+scroll+',resizable='+resize;
    win = window.open(mypage, myname, winprops)
    if (parseInt(navigator.appVersion) >= 4) { win.window.focus(); }
}

function PopUp(url) {
    NewWindow(url,'popupwindow',150,150,'no','no');
}

function PrintPopUp(mypage) {
    NewWindow(mypage,'printversion',700,500,'yes','no');
}