twitter: [Rails] want to destroy session on browser close for logout

hii

i have my ror app website want to do destroy session on browser
close ,

please help how can i destroy..

i have used javascript function on body unload

function bunload()
{
document.location.href="del.rb";
}
</script>
</head>
<body onunload="bunload()">

and i have putted the del.rb file in my public folder and in that i
have putted the following code

session[:user] = nil

but its not destroying the session..

please help..

thanks

rahul

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