Why does the following jQuery function fire twice?

I have the following in my (document).ready function:

replace_fav_url();

and the jQuery function:

function replace_fav_url(){
    $j('a.fav').click(function(e) {
        $j.post($j(this).attr('href'));
        e.preventD开发者_运维知识库efault();
    });
}

Everything works good with the exception that function seems to be called twice? 1 click two function calls? Not sure what is going on here?

EDIT:

FULL application.js file:

var $j = jQuery.noConflict();

//Append javascritp header requests
$j.ajaxSetup({ 
  'beforeSend': function(xhr) {xhr.setRequestHeader("Accept", "text/javascript")}
});


$j(document).ready(function() {

    $j(document).ajaxSend(function(event, request, settings) {
    if (settings.type == 'GET') return;
    if (typeof(AUTH_TOKEN) == "undefined") return;
    settings.data = settings.data || "";
    settings.data += (settings.data ? "&" : "") + "authenticity_token=" + encodeURIComponent(AUTH_TOKEN);
  });


    replace_vote_urls();
    replace_fav_url();
});


function replace_vote_urls(){
    $j('a.vote').click(function(e) {
        $j.post($j(this).attr('href'));
        e.preventDefault();
    });

} 


function replace_fav_url(){
    $j('a.fav').click(function(e) {
        $j.post($j(this).attr('href'));
        e.preventDefault();
    });
}

I'm only guessing this is the problem, but if you call the replace_fav_url() function more than once, it will bind an additional click event to a.fav. And will continue to do so each time you call it.

If you change the number of a.fav elements in any way, it would be better to use delegate() or live() to bind a click event.