top.location.replace - ?

[louie]

Vot kusok script-a kotory xochu ispol'zovat' dlya togo chtob opredelit' esli stranica prosmatrivaetsya v frame-e na chuzhem hoste ili net, i sootveststvenno pereyti na moy URL ili net.
No etot script ne rabotaet normal'no... v chem oshibka? ili est' sposob luchshe?

if (parent.location.hostname!="www.aaa.com") {top.location.replace="http://www.aaa.com"};

spasibo
lu