if (top.frames.length > 0) {
  top.location.href="index.html";
}
function tarifrechner() {
         tarifwindow=window.open (
             "tarifrechner.html",
             "rechner",
             "toolbar=no,scrollbars=no,location=no,resizable=no,width=500,height=300");
}
function agbWindow() {
         tarifwindow=window.open (
             "../agb_win.html",
             "agb",
             "toolbar=no,scrollbars=yes,location=no,resizable=yes,width=550,height=350");
}