JavaScript多域名轉向

<script>
try {
if( self.location == "http://域名一/index.html" )
{
top.location.href = "http://域名一/目錄";
}
else if( self.location == "http://域名二/index.html" )
{
top.location.href = "http://域名二/目錄";
}
else
{
document.write("錯誤的網址")
}
catch(e){}
</script>