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javascript event on controller ?

Hi, i'm trying to include a javascript alert on a controller function but it seems like doesnt work. I'm just started with AJAX and JS codding.

Here is pertinent function from my view
function checkBan(){
       type: "POST",
       url: "xxxxxxxxxxxxxxxxxxxxx/fmchat/check_ban",

setInterval (checkBan, 1500);

This is my controller function
function check_ban() {
      if ($this->session->userdata('ban')<>'') {
        <.script language="JavaScript" type="text/javascript">
           .alert('User banned');  

I dont know if it's an ajax problem or just javascript is not allowed on controllers.
I'll regards every kind of tip, help or comment.

[eluser]Michael Wales[/eluser]
You should really keep your JavaScript w/ your JavaScript and your PHP w/ your PHP. I would have my controller respond with a JSON response, handle that with the JS callback.

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