wordpress file upload with ajax when site is ajaxyfi

[rdunksdzf]

I am getting problem in upload any file. My word press site is using Ajax Page Loader Plugin.So page is not refreshing when the form is submitting..I am not getting any value in \[code\]PHP\[/code\] code in functions.php in print_r($_FILES);But when i am printing any string with \[code\]echo();\[/code\] it is printing but why print_r($_FILES); is not getting any value.HTML form\[code\]<form id="career_form" name="career_form" enctype="multipart/form-data"> <span id='errfrmMsg' style='margin:0 auto;'></span> Upload : <input id="career_resume" class="field" style="height: 25px;" type="file" name="career_resume" multiple /></td> <input type="hidden" name="action" value="http://stackoverflow.com/questions/15563440/career" /> <input id="submit_button" onclick="submit_career();" type="button" value="http://stackoverflow.com/questions/15563440/Send" /></form>\[/code\]j Query\[code\]function submit_career(){ jQuery.post(the_ajax_career.ajaxurl_career, jQuery("#career_form").serialize(), function(response_from_the_action_function){ jQuery("#errfrmMsg").html(response_from_the_action_function).css({"display":"block"}); } );}\[/code\]Php code in functions.php\[code\]wp_register_script("ajax-career", get_bloginfo('template_directory')."/js/custom_js.js", array( "jquery")); wp_enqueue_script('ajax-career'); wp_localize_script("ajax-career","the_ajax_career", array("ajaxurl_career" => admin_url("admin-ajax.php"))); // add actions add_action( "wp_ajax_career", "ajax_action_career" ); add_action( "wp_ajax_nopriv_career", "ajax_action_career" ); function ajax_action_career(){ //Nothing getting in this print_r($_FILES) function; foreach ($_FILES["career_resume"]["error"] as $key => $error) { if ($error == UPLOAD_ERR_OK) { $name = $_FILES["career_resume"]["name"][$key]; move_uploaded_file( $_FILES["career_resume"]["tmp_name"][$key], "uploads/" . $_FILES['career_resume']['name'][$key]); } } }\[/code\]