JS works perfect on home machine, not so much on server

I'm pulling some videos from youtube to display on a multimedia page on a site. The code has been working fine for a while, but now, mysteriously, it's broken. Testing on my home machine shows everything works fine. Any idea why this might happen? (note: wordpress site, js is external from WP post, code is visible @ github, no noticeable errors using browser tools or online js lint)

Thanks in advance...

Javascript:

$(document).ready(function() {
  //some variables
  var videos = [];                      //placeholder for video information returned from youtube
  var video_elm_arr = $('.video');      //array of 'video' elements in DOM      
  //hide videos until ready
  $('.video').addClass('hidden');      
  //pull video data from youtube
  开发者_StackOverflow中文版$.ajax({
    url: 'http://gdata.youtube.com/feeds/api/users/danwoodson/uploads?alt=json',
    dataType: 'jsonp',
    success: function(data) {
      alert(data);
      $.each(data.feed.entry, function(i,item){
        //only take the first 7 videos
        if(i > 6)
          return;              
        //create object to hold the video's info
        videos[i] = {};
        videos[i].title = item.title.$t;
        videos[i].url = item.media$group.media$content[0].url;          //this will need to be cleaned before use
        videos[i].summary = item.content.$t;   
        videos[i].thumbnail = item.media$group.media$thumbnail[3].url;              
        //assign title
        $(video_elm_arr[i]).find('.video_title').append(videos[i].title);            
        //clean url
        var video_url = videos[i].url;
        var index = video_url.indexOf("?");
          if (index > 0)
            video_url = video_url.substring(0, index);
        //and re-assign
        videos[i].url = video_url;                         
        if(i == 0){ //only for featured/main
          //insert flash object in video element
          $(video_elm_arr[i]).find('.video_title').after('<object id="video_0" width="475" height="267.1875">' + 
                                   '<param name="movie" value="' + video_url + '&showinfo=0"></param>' +
                                   '<param name="allowFullScreen" value="true"></param>' +
                                   '<param name="allowscriptaccess" value="always"></param>' +
                                   '<embed src="' + video_url + '&showinfo=0" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="475" height="267.1875"></embed>' +
                                   '</object>');
          //and include summary
          $(video_elm_arr[i]).find('#featured_summary').html(videos[i].summary);
        }
        else{ //else just use thumbnail and enlarge
          $(video_elm_arr[i]).find('.video_title').after('<img src="' + videos[i].thumbnail +'" alt="video" id="video_' + i + '" />');
          $(video_elm_arr[i]).find('img').animate({height: 84.375, width: 150}, 500);            
        }                       
        //and finally show
        $(video_elm_arr[i]).removeClass('hidden');
      });
    },
    error: function(XMLHttpRequest, textStatus, errorThrown) {alert("error with retrieving videos");}
  });      
  //create functionality
  $('.non_featured').bind('click', function(){
    //get clicked video's id
    var clicked_vid_id = $(this).find('img').attr('id');
    //clean
    var index = clicked_vid_id.indexOf("_");
    if (index > 0)
      clicked_vid_id = clicked_vid_id.substring(index+1);        
    //get featured video's id
    var cur_featured_vid_id = $('#featured').find('object').attr('id');
    //clean
    var index = cur_featured_vid_id.indexOf("_");
    if (index > 0)
      cur_featured_vid_id = cur_featured_vid_id.substring(index+1);        
    //create new swf object with clicked video's information
    var new_featured_vid_swf = '<object id="video_' + clicked_vid_id + '" width="475" height="267.1875">' + 
                               '<param name="movie" value="' + videos[clicked_vid_id].url + '?showinfo=0&autoplay=1"></param>' +
                               '<param name="allowFullScreen" value="true"></param>' +
                               '<param name="allowscriptaccess" value="always"></param>' +
                               '<embed src="' + videos[clicked_vid_id].url + '?showinfo=0&autoplay=1" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="475" height="267.1875"></embed>' +
                               '</object>';        
    //clear out clicked video's image
    $(this).find('img').remove();               
    //clear out featured video's original swf object
    $('#featured').find('object').remove();                
    /*assign newly created swf objects to their appropriate locations*/
    //set clicked
    $(this).find('.video_title').html(videos[cur_featured_vid_id].title);
    $(this).append('<img src="' + videos[cur_featured_vid_id].thumbnail +'" alt="video" id="video_' + cur_featured_vid_id + '" />');
    $(this).find('img').animate({height: 84.375, width: 150}, 500);
    //and set new featured/main
    $('#featured').find('.video_title').html(videos[clicked_vid_id].title);
    $('#featured').find('.video_title').after(new_featured_vid_swf);
    $('#featured').find('#featured_summary').html(videos[clicked_vid_id].summary);        
  });
});

From your page, these are the errors that occur. Internet Explorer, Chrome, and Firefox all have good debuggers/JavaScript consoles available to show this information.

'pollsL10n' is undefined  polls-js.js?ver=2.50, line 1 character 62
pollsL10n.show_loading=parseInt(pollsL10n.show_loading)


Object doesn't support this property or method  headcount-multimedia, line 135 character 9
$(".tweet").tweet({


Object doesn't support this property or method  slider.js, line 32 character 4
jQuery("#main-photo-slider").codaSlider();

Object doesn't support this property or method  main.js, line 31 character 1
jQuery.cookie('widget widget_text');