[JS]can't change top's title

[pl1987]

Hello, i have strange problem. I've simple page with frameset on freeDNS serwer (don't have access to change anything) and the page on mine server. I want to change the title of browser's bar

self.parent.document.title = 'my own title';
//or
top.document.title = 'my own title';
 

without result. What suprised me a lot, when i put code for "escaping from frame"

function changePage()
{
  if (self.parent.frames.length != 0)
  {
      alert("beware! You are in frame!");
//        alert(self.parent.location);
        self.parent.location=document.location;
  }
}
setTimeout ("changePage()", 2000);
 

it works fine. But when I remove comment "//" from in front of alert(self...) I get an error.

I tested this code on IE6 and FF2.04

Ps. It works when the page in frameset is a local file

[acoder]

Welcome to TSDN!

This problem occurs because Javascript does not allow cross-domain scripting for security reasons.