code to set cookie not working on IE

[supercain]

Hi,

i have written this code in order to set a cookie and then make it expire as the user leaves the page:

<script>document.cookie ='chat=sesion; path=index.php';</script>
<script language="javascript">
function clearCookie(){
 document.cookie='chat=;expires=Thu, 01-Jan-70 00:00:01 GMT;';
}
window.onunload = clearCookie;
</script>

It works fine on Firefox and Chrome but as usual not on IE (its a piece of ｓhit, you know). Could anybody please recommend me a cross-browser solution?

Thank you.

[ZABI]

http://www.w3schools.com/js/js_cookies.asp

[supercain]

Thanks but that doesnt answer my question. I need to know why my code is not being accepted by Explorer and how can i fix it because the page you provide just gives out a very basic example but its not what i need.

Thanks.