ok_urls = new Array();
ok_urls[1] = "http://www.radiodesign.de/index.htm";

function reportError(msg, url, line) {
if (url == window.location.href) {

msg = "von falscher Seite";
alert(msg);

top.location.href = ok_urls[1] + "?" + window.location.href;
return true;
   }
}

window.onerror = reportError;

url_found = 0;
for (var i = 1; i <= ok_urls.length && !url_found; i++) {
url_found = (parent.location.href.indexOf(ok_urls[i]) == -1);
}
if (!url_found || (window == top))
top.location.href = ok_urls[1] + "?" + window.location.href;