[jQuery] Form submit issues

[jQuery] Form submit issues


What is wrong with this code?
<code>$(document).ready(function() {
    $("#f_submit").hide();
    $("#f_altsubmit").click(function(event) {
        $("#checkoutform")[0].submit();
        return false;
    });
});</code>
In FF3 this throws an error in the Error console : Error: $("form")
[0].submit is not a function
but this error does not show up in Firebug.
Also what is strange is that when i change the method from submit() to
reset() ... the reset works ...
It seems my form doesn't have the submit method in FF3????
See for yourself at http://dev.rotarygiftshop.com/cart/checkout