diff --git a/inc/myco.js b/inc/myco.js
index bda33a2..5a43042 100644
--- a/inc/myco.js
+++ b/inc/myco.js
@@ -1,15 +1,15 @@
 refresh_group_list=function() {
-  grouplist=$('#group-choice')[0];
+  grouplist=$('#group-choice');
   $('a.group-choice').each(function(idx,a) {
     $(a).parent().remove();
   });
 
   if (groups.count()==0) {
-    $(grouplist).prepend('<li><a class="group-choice">Aucune groupe</a></li>');
+    grouplist.prepend('<li><a class="group-choice">Aucune groupe</a></li>');
   }
   else { 
     groups.each(function(idx,group) {
-      $(grouplist).prepend('<li><a class="group-choice" data-uuid="'+group.uuid+'">'+group.name+'</a></li>');
+      grouplist.prepend('<li><a class="group-choice" data-uuid="'+group.uuid+'">'+group.name+'</a></li>');
     });
 
     $('a.group-choice').each(function(idx,a) {
@@ -34,7 +34,7 @@ on_show_add_group_modal=function(e) {
 
 on_valid_add_group_modal=function (e) {
   e.preventDefault();
-  var name=$('#add_group_name')[0].value;
+  var name=$('#add_group_name').val();
   if (name=='') {
     alert('Vous devez saisir un nom !');
     return;
@@ -172,14 +172,14 @@ on_contributor_change=function(e) {
 		$('#group-navbar-collapse-1').collapse('hide');
 	}
 	$('#view-group #group-username').html($('#view-group #contributor option:selected').text());
-	show_contributions(groups[$('#view-group').data('uuid')],$('#view-group #contributor')[0].value);
-	$('#nav-search-form input')[0].value='';
+	show_contributions(groups[$('#view-group').data('uuid')],$('#view-group #contributor').val());
+	$('#nav-search-form input').val('');
 }
 
 _current_displayed_contributions=[];
 _current_displayed_contributions_group=null;
 show_contributions=function(group,contributor_email,contributions) {
-  var tbody=$($('#view-group #contributions tbody')[0]);
+  var tbody=$('#view-group #contributions tbody').first();
   tbody.html('');
   if (!contributions) {
     contributions=group.contributionsByContributorEmail(contributor_email);
@@ -192,7 +192,7 @@ show_contributions=function(group,contributor_email,contributions) {
 
 show_more_contributions=function(count) {
   if (!_current_displayed_contributions_group) return;
-  var tbody=$($('#view-group #contributions tbody')[0]);
+  var tbody=$('#view-group #contributions tbody').first();
    if (_current_displayed_contributions.length==0) {
     tbody.html('');
     tbody.append('<tr><td colspan=3>Aucune contributions</td></tr>');
@@ -311,7 +311,7 @@ on_categories_go_back_group_btn_click=function(e) {
 
 on_categories_group_add_btn_click=function(e) {
   e.preventDefault();
-  name=$('#add_category input')[0].value;
+  name=$('#add_category input').val();
   
   if (jQuery.type(name)!='string' || name=='') {
     return;
@@ -324,7 +324,7 @@ on_categories_group_add_btn_click=function(e) {
   }
   else {
     group.addCategory(new Category(name));
-    $('#add_category input')[0].value='';
+    $('#add_category input').val('');
     refresh_group_categories(group);
     $('#add_category input').focus();
   }
@@ -349,7 +349,7 @@ on_nav_search_form_input=function(e) {
   var pattern=ipt.val();
 
   group=groups[$('#view-group').data('uuid')];
-  contributor_email=$('#view-group #contributor')[0].value;
+  contributor_email=$('#view-group #contributor').val();
  
   var found=group.searchContributions(pattern,contributor_email);
   show_contributions(group,null,found);
@@ -362,7 +362,7 @@ on_nav_search_form_input=function(e) {
 
 on_trash_group_btn_click=function(e) {
   group=groups[$('#view-group').data('uuid')];
-  contributor_email=$('#view-group #contributor')[0].value;
+  contributor_email=$('#view-group #contributor').val();
   bottom_navbar_collapse_hide();
   view_group_trash(group,contributor_email);
 }
@@ -396,7 +396,7 @@ view_group_trash=function(group,contributor_email) {
 
 on_contribution_restore_btn_click=function(e) {
   var group=groups[$('#view-group-trash').data('uuid')];
-  contribution_uuid=$($(e.target).parents('tr')[0]).data('uuid');
+  contribution_uuid=$(e.target).parents('tr').first().data('uuid');
   contribution=group.importContribution(group.deletedContributions[contribution_uuid]);
   myconfirm('Etes-vous sûre de vouloir restaurer la participation '+contribution.getTitle()+' de '+contribution.contributor.name+' ?',on_confirm_contribution_restore,null,{'group':group,'contribution_uuid':contribution_uuid, 'contribution': contribution} );
 }
@@ -438,7 +438,7 @@ view_group_trash_contributors=function(group) {
 
 on_contributor_restore_btn_click=function(e) {
   var group=groups[$('#view-group-trash-contributors').data('uuid')];
-  contributor_email=$($(e.target).parents('tr')[0]).data('email');
+  contributor_email=$(e.target).parents('tr').first().data('email');
   contributor=group.importContributor(group.deletedContributors[contributor_email]);
   myconfirm('Etes-vous sûre de vouloir restaurer '+contributor.name+' ?',on_confirm_contributor_restore,null,{'group':group,'contributor_email':contributor_email, 'contributor': contributor} );
 }
@@ -454,8 +454,8 @@ on_confirm_contributor_restore=function(data) {
  ******************************/
 on_click_add_contributor_btn=function() {
   $('#add_contributor_modal').data('group-uuid',$('#view-group').data('uuid'))
-  $($('#add_contributor_modal h4')[0]).html('Ajouter un participant');
-  $($('#add_contributor_modal #add_contributor_submit')[0]).html('Ajouter');
+  $('#add_contributor_modal h4').first().html('Ajouter un participant');
+  $('#add_contributor_modal #add_contributor_submit').first().html('Ajouter');
   $('#add_contributor_modal').data('edit-id','-1');
   $('#add_contributor_modal #add_contributor_email').attr('disabled',false);
   $('#add_contributor_modal').modal('show');
@@ -473,13 +473,13 @@ validateEmail=function(email) {
 on_valid_add_contributor_modal=function(e) {
   e.preventDefault();
   var group=groups[$('#add_contributor_modal').data('group-uuid')];
-  var name=$('#add_contributor_name')[0].value;
+  var name=$('#add_contributor_name').val();
   var edit_id=$('#add_contributor_modal').data('edit-id');
   if (name=='') {
     alert('Vous devez saisir un nom !');
     return;
   }
-  var email=$('#add_contributor_email')[0].value;
+  var email=$('#add_contributor_email').val();
   if (email=='') {
     alert('Vous devez saisir un email !');
     return;
@@ -506,27 +506,27 @@ on_valid_add_contributor_modal=function(e) {
 }
 
 on_close_add_contributor_modal=function () {
-  $('#add_contributor_name')[0].value='';
-  $('#add_contributor_email')[0].value='';
+  $('#add_contributor_name').val('');
+  $('#add_contributor_email').val('');
 }
 
 on_edit_contributor_btn_click=function(e) {
   var group=groups[$('#view-group').data('uuid')];
   $('#add_contributor_modal').data('group-uuid',group.uuid);
-  contributor_email=$('#view-group #contributor')[0].value;
+  contributor_email=$('#view-group #contributor').val();
   contributor=group.contributorByEmail(contributor_email);
   $('#add_contributor_modal').data('edit-id',contributor_email);
-  $('#add_contributor_modal #add_contributor_name')[0].value=contributor.name;
-  $('#add_contributor_modal #add_contributor_email')[0].value=contributor.email;
+  $('#add_contributor_modal #add_contributor_name').val(contributor.name);
+  $('#add_contributor_modal #add_contributor_email').val(contributor.email);
   $('#add_contributor_modal #add_contributor_email').attr('disabled',true);
-  $($('#add_contributor_modal h4')[0]).html('Editer un participant');
-  $($('#add_contributor_modal #add_contributor_submit')[0]).html('Valider');
+  $('#add_contributor_modal h4').html('Editer un participant');
+  $('#add_contributor_modal #add_contributor_submit').html('Valider');
   $('#add_contributor_modal').modal('show');
 }
 
 on_click_del_contributor_btn=function() {
   var group=groups[$('#view-group').data('uuid')];
-  contributor=group.contributorByEmail($('#view-group #contributor')[0].value);
+  contributor=group.contributorByEmail($('#view-group #contributor').val());
   question='Voulez-vous vraiment supprimer '+contributor.name+' ?';
   myconfirm(question,on_confirm_del_contributor,null,contributor);
 }
@@ -544,7 +544,7 @@ on_confirm_del_contributor=function(contributor) {
 last_selected_date=moment().format('DD/MM/YYYY');
 on_show_add_contribution_modal=function(e) {
   $('#add_contribution_modal #add_contribution_contributor_email').html($('#view-group #contributor').html());
-  $('#add_contribution_modal #add_contribution_contributor_email')[0].value=$('#view-group #contributor')[0].value;
+  $('#add_contribution_modal #add_contribution_contributor_email').val($('#view-group #contributor').val());
   gid=$('#add_contribution_modal').data('group-uuid');
   group=groups[gid];
   populate_add_contribution_categories(group);
@@ -566,7 +566,7 @@ populate_add_contribution_categories=function(group,select) {
     gid=$('#add_contribution_modal').data('group-uuid');
     group=groups[gid];
   }
-  current_cat=$('#add_contribution_modal #add_contribution_category')[0].value;
+  current_cat=$('#add_contribution_modal #add_contribution_category').val();
   cats="<option value=''>Non définie</option>";
   for (u in group.getSortedCategories()) {
 	cats+="<option value='"+u+"'>"+group.categories[u]['name']+"</option>";
@@ -588,11 +588,11 @@ on_select_contribution_suggestion=function(event,choice,name) {
 
 on_click_add_contribution_btn=function() {
   $('#add_contribution_modal').data('group-uuid',$('#view-group').data('uuid'));
-  $('#add_contribution_modal #edit_uuid')[0].value='-1';
+  $('#add_contribution_modal #edit_uuid').val('-1');
   $('#add_contribution_date').val(last_selected_date);
   $('#add_contribution_date').data('value',last_selected_date);
-  $($('#add_contribution_modal h4')[0]).html('Ajouter une contribution');
-  $($('#add_contribution_modal #add_contribution_submit')[0]).html('Ajouter');
+  $('#add_contribution_modal h4').html('Ajouter une contribution');
+  $('#add_contribution_modal #add_contribution_submit').html('Ajouter');
   $('#add_contribution_modal').modal('show');
   $('#add_contribution_title').val('').focus();
 }
@@ -600,19 +600,19 @@ on_click_add_contribution_btn=function() {
 on_valid_add_contribution_modal=function(e) {
   e.preventDefault();
   var group=groups[$('#add_contribution_modal').data('group-uuid')];
-  var contributor_email=$('#add_contribution_contributor_email')[0].value;
+  var contributor_email=$('#add_contribution_contributor_email').val();
   var contributor=group.contributorByEmail(contributor_email);
   if (contributor==undefined) {
     alert('Participant inconu !');
     return;
   }
-  var title=$('#add_contribution_title')[0].value;
+  var title=$('#add_contribution_title').val();
   if (title=='') {
     $('#add_contribution_title').focus();
     alert('Vous devez saisir un titre !');
     return;
   }
-  var cost=$('#add_contribution_cost')[0].value;
+  var cost=$('#add_contribution_cost').val();
   if (cost=='') {
     $('#add_contribution_cost').focus();
     alert('Vous devez saisir un coût !');
@@ -625,7 +625,7 @@ on_valid_add_contribution_modal=function(e) {
   }
   cost=parseFloat(cost.replace(',','.'));
   
-  var date=$('#add_contribution_date')[0].value;
+  var date=$('#add_contribution_date').val();
   date.replace(/ /g,'');
   if (date!='') {
     if(!RegExp('^[0-3][0-9]\/[0-1][0-9]\/[0-2][0-9][0-9][0-9]$').test(date)) {
@@ -644,20 +644,20 @@ on_valid_add_contribution_modal=function(e) {
   }
   last_selected_date=moment(date).format('DD/MM/YYYY');
   
-  var cat=$('#add_contribution_category')[0].value;
+  var cat=$('#add_contribution_category').val();
   if (cat != '' && !jQuery.type(group.categories[cat])) {
 	alert('Category incorrect');
 	return;
   }
   
-  if($('#add_contribution_modal #edit_uuid')[0].value=='-1') {
+  if($('#add_contribution_modal #edit_uuid').val()=='-1') {
     group.addContribution(new Contribution(contributor,cost,title,date,cat));
   }
   else {
-    contribution_uuid=$('#add_contribution_modal #edit_uuid')[0].value;
+    contribution_uuid=$('#add_contribution_modal #edit_uuid').val();
     group.updateContribution(contribution_uuid,new Contribution(contributor,cost,title,date,cat));
   }
-  show_contributions(group,$('#view-group #contributor')[0].value);
+  show_contributions(group,$('#view-group #contributor').val());
   $('#add_contribution_modal').modal('hide');
   $('#add_contribution_modal form')[0].reset();
   groups.save();
@@ -669,7 +669,7 @@ on_close_add_contribution_modal=function () {
 
 on_contribution_delete_btn_click=function(e) {
   var group=groups[$('#view-group').data('uuid')];
-  contribution_uuid=$($(e.target).parents('div')[0]).data('uuid');
+  contribution_uuid=$(e.target).parents('div').first().data('uuid');
   contribution=group.contributions[contribution_uuid];
   myconfirm('Etes-vous sûre de vouloir supprimer la participation '+contribution.getTitle()+' de '+contribution.contributor.name+' ?',on_confirm_contribution_delete,null,{'group':group,'contribution_uuid':contribution_uuid, 'contribution': contribution} );
 }
@@ -683,19 +683,19 @@ on_confirm_contribution_delete=function(data) {
 on_contribution_edit_btn_click=function(e) {
   var group=groups[$('#view-group').data('uuid')];
   $('#add_contribution_modal').data('group-uuid',$('#view-group').data('uuid'));
-  $($('#add_contribution_modal h4')[0]).html('Editer une contribution');
-  $($('#add_contribution_modal #add_contribution_submit')[0]).html('Valider');
-  contribution_uuid=$($(e.target).parents('div')[0]).data('uuid');
+  $('#add_contribution_modal h4').first().html('Editer une contribution');
+  $('#add_contribution_modal #add_contribution_submit').html('Valider');
+  contribution_uuid=$(e.target).parents('div').first().data('uuid');
   contribution=group.contributions[contribution_uuid];
-  $('#add_contribution_modal #add_contribution_contributor_email')[0].value=contribution.contributor.email;
-  $('#add_contribution_modal #add_contribution_title')[0].value=contribution.getTitle();
-  $('#add_contribution_modal #add_contribution_cost')[0].value=contribution.cost;
-  $('#add_contribution_modal #add_contribution_date')[0].value=moment(contribution.date).format('DD/MM/YYYY');
+  $('#add_contribution_modal #add_contribution_contributor_email').val(contribution.contributor.email);
+  $('#add_contribution_modal #add_contribution_title').val(contribution.getTitle());
+  $('#add_contribution_modal #add_contribution_cost').val(contribution.cost);
+  $('#add_contribution_modal #add_contribution_date').val(moment(contribution.date).format('DD/MM/YYYY'));
   $('#add_contribution_modal #add_contribution_date').data('value',moment(contribution.date).format('DD/MM/YYYY'));
   if (contribution.category) {
     populate_add_contribution_categories(group,contribution.category);
   }
-  $('#add_contribution_modal #edit_uuid')[0].value=contribution_uuid;
+  $('#add_contribution_modal #edit_uuid').val(contribution_uuid);
   $('#add_contribution_modal').modal('show');
 }
 
@@ -725,7 +725,7 @@ on_display_balance_btn_click=function(e) {
 
 display_balance=function(group) {
   bal=group.balance();
-  tbody=$($('#display_balance_modal tbody')[0]);
+  tbody=$('#display_balance_modal tbody').first();
   tbody.html('');
   for (c in bal['balance']) {
     if(bal['balance'][c]['diff']<0) {
@@ -770,9 +770,9 @@ on_close_login_modal=function(e) {
 sync_server=false;
 on_valid_login_modal=function(e) {
   e.preventDefault();
-  email=$('#login_modal #login_email')[0].value;
-  pass=$('#login_modal #login_pass')[0].value;
-  server=$('#login_modal #login_server')[0].value;
+  email=$('#login_modal #login_email').val();
+  pass=$('#login_modal #login_pass').val();
+  server=$('#login_modal #login_server').val();
   $('#login_modal').modal('hide');
   pleaseWaitShow();
   sync_server.login(server,email,pass,
@@ -815,10 +815,10 @@ on_close_subscribe_modal=function(e) {
 sync_server=false;
 on_valid_subscribe_modal=function(e) {
   e.preventDefault();
-  email=$('#subscribe_modal #subscribe_email')[0].value;
-  name=$('#subscribe_modal #subscribe_name')[0].value;
-  pass=$('#subscribe_modal #subscribe_pass')[0].value;
-  server=$('#subscribe_modal #subscribe_server')[0].value;
+  email=$('#subscribe_modal #subscribe_email').val();
+  name=$('#subscribe_modal #subscribe_name').val();
+  pass=$('#subscribe_modal #subscribe_pass').val();
+  server=$('#subscribe_modal #subscribe_server').val();
   $('#subscribe_modal').modal('hide');
   pleaseWaitShow();
   sync_server.subscribe(server,email,name,pass,
@@ -902,7 +902,7 @@ on_export_all_btn_click=function(e) {
   a.attr('href',window.URL.createObjectURL(blob));
   a.css('display','none');
   $('body').append(a);
-  a[0].click();
+  a.click();
   a.remove();
 }
 
@@ -915,7 +915,7 @@ on_import_all_btn_click=function(e) {
       var input=$('<input type="file"/>');
       input.css('display','none');
       $('body').append(input);
-      input[0].click();
+      input.click();
       input.bind('change',{'input': input},function(e) {
         pleaseWaitShow();
         var file=input.prop('files')[0];
@@ -983,7 +983,7 @@ logged_out_menu=function() {
 
 on_click_myaccount_btn=function() {
   $('#myaccount_modal #myaccount_email').html(user.email);
-  $('#myaccount_modal #myaccount_name')[0].value=user.name;
+  $('#myaccount_modal #myaccount_name').val(user.name);
   $('#myaccount_modal #myaccount_server').html(user.server);
   if (user.lastsync) {
     $('#myaccount_modal #myaccount_lastsync').html(moment(user.lastsync).format('DD/MM/YYYY HH:mm:ss'));