How to call the function from another URL page

[usher]

How to call the function from another URL page?
ex.
192.168.0.90/top.htm:
function foo(){
alert(1);
}

<frameset>
<frame src="192.168.0.91/left.htm>
...

192.168.0.91/left.htm:
top.foo();
----------------------------
but the browser will display the msg of
"you have no the right to do that"

My good friend, who know what's Happen?

[pyro]

Looks like your working across domains? If so, security protocols will not allow you to do many of the things that you normally could do.