function popup_window(x,y,link) {
    var winx;
    var winy;

    winx = screen.width;
    winy = screen.height;

    fx = winx/2 - x/2;
    fy = winy/2 - y/2;
    window.open(link,null,"height="+y+",width="+x+",status=yes,scrollbars=1,toolbar=no,menubar=no,location=no,left="+fx+",top="+fy+"");
}

function PWNamed(x,y,link,name) {
    var winx;
    var winy;

    winx = screen.width;
    winy = screen.height;

    fx = winx/2 - x/2;
    fy = winy/2 - y/2;
    window.open(link,name,"height="+y+",width="+x+",status=yes,scrollbars=1,toolbar=no,menubar=no,location=no,left="+fx+",top="+fy+"");
}