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