Hi all i am developing a chat application ... i have multiple chat windows ... i want to know which windw contain new message ... i have the following code ..

function getCount()
{
    $.ajax({
       type: "POST",
       url: baseUrl + '/Chat/count',
       data: "chat_id=" + document.ajax.chat_id.value,
       success: function(msg){
                if(msg == 'new1') {
                    self.focus();

                }
            }
    });
}

This code is work fine with IE but not in firefox...please give me a solution... the above code is in the same html