diff --git a/admin/batch_manager_global.php b/admin/batch_manager_global.php
index 5453d447f..374041b9a 100644
--- a/admin/batch_manager_global.php
+++ b/admin/batch_manager_global.php
@@ -361,12 +361,13 @@ DELETE
   {
     if (isset($_POST['confirm_deletion']) and 1 == $_POST['confirm_deletion'])
     {
-      $deleted_count = delete_elements($collection, true);
-      if ($deleted_count > 0)
+      // now done with ajax calls, with blocks
+      // $deleted_count = delete_elements($collection, true);
+      if (count($collection) > 0)
       {
         $_SESSION['page_infos'][] = l10n_dec(
           '%d photo was deleted', '%d photos were deleted',
-          $deleted_count
+          count($collection)
           );
 
         $redirect_url = get_root_url().'admin.php?page='.$_GET['page'];
diff --git a/admin/themes/default/js/batchManagerGlobal.js b/admin/themes/default/js/batchManagerGlobal.js
index fc8d094ab..803402dbe 100644
--- a/admin/themes/default/js/batchManagerGlobal.js
+++ b/admin/themes/default/js/batchManagerGlobal.js
@@ -215,3 +215,108 @@ function selectDelDerivAll() {
 function selectDelDerivNone() {
 	$("#action_delete_derivatives input[type=checkbox]").prop("checked", false);
 }
+
+/* delete photos by blocks, with progress bar */
+jQuery('#applyAction').click(function(e) {
+  if (typeof(elements) != "undefined") {
+    return true;
+  }
+
+  if (jQuery('[name="selectAction"]').val() == 'delete') {
+    if (!jQuery("#action_delete input[name=confirm_deletion]").is(':checked')) {
+      jQuery("#action_delete span.errors").show();
+      return false;
+    }
+    e.stopPropagation();
+  }
+  else {
+    return true;
+  }
+
+  jQuery('.bulkAction').hide();
+  jQuery('#regenerationText').html(lang.deleteProgressMessage);
+  var maxRequests=1;
+
+  var queuedManager = jQuery.manageAjax.create('queued', {
+    queue: true,
+    cacheResponse: false,
+    maxRequests: maxRequests
+  });
+
+  elements = Array();
+
+  if (jQuery('input[name=setSelected]').is(':checked')) {
+    elements = all_elements;
+  }
+  else {
+    jQuery('input[name="selection[]"]').filter(':checked').each(function() {
+      elements.push(jQuery(this).val());
+    });
+  }
+
+  progressBar_max = elements.length;
+  var todo = 0;
+  var deleteBlockSize = Math.min(
+    Number((elements.length/2).toFixed()),
+    1000
+  );
+  var image_ids = Array();
+
+  jQuery('#applyActionBlock').hide();
+  jQuery('select[name="selectAction"]').hide();
+  jQuery('#regenerationMsg').show();
+  jQuery('#progressBar').progressBar(0, {
+    max: progressBar_max,
+    textFormat: 'fraction',
+    boxImage: 'themes/default/images/progressbar.gif',
+    barImage: 'themes/default/images/progressbg_orange.gif'
+  });
+
+  for (i=0;i<elements.length;i++) {
+    image_ids.push(elements[i]);
+    if (i % deleteBlockSize != deleteBlockSize - 1 && i != elements.length - 1) {
+      continue;
+    }
+
+    queuedManager.add({
+      type: 'POST',
+      url: 'ws.php?format=json',
+      data: {
+        method: "pwg.images.delete",
+        pwg_token: jQuery("input[name=pwg_token").val(),
+        return_details: true,
+        image_id: image_ids.join(',')
+      },
+      dataType: 'json',
+      success: ( function(data) {
+        todo += data.result.nb_processed;
+        progressDelete(todo, progressBar_max, true)
+      }),
+      error: ( function(data) {
+        todo += deleteBlockSize; // TODO: might be not exact, if last query
+        progressDelete(todo, progressBar_max, false)
+      })
+    });
+
+    image_ids = Array();
+  }
+  return false;
+});
+
+function progressDelete(val, max, success) {
+  jQuery('#progressBar').progressBar(val, {
+    max: max,
+    textFormat: 'fraction',
+    boxImage: 'themes/default/images/progressbar.gif',
+    barImage: 'themes/default/images/progressbg_orange.gif'
+  });
+
+  if (val == max) {
+    jQuery('#applyAction').click();
+  }
+}
+
+
+jQuery("#action_delete input[name=confirm_deletion]").change(function() {
+  jQuery("#action_delete span.errors").hide();
+});
diff --git a/admin/themes/default/template/batch_manager_global.tpl b/admin/themes/default/template/batch_manager_global.tpl
index 51325a253..b9ce4c0c5 100644
--- a/admin/themes/default/template/batch_manager_global.tpl
+++ b/admin/themes/default/template/batch_manager_global.tpl
@@ -21,6 +21,7 @@
 {footer_script}
 var lang = {
 	Cancel: '{'Cancel'|translate|escape:'javascript'}',
+	deleteProgressMessage: "{'Deletion in progress'|translate|escape:'javascript'}",
 	AreYouSure: "{'Are you sure?'|translate|escape:'javascript'}"
 };
 
@@ -226,7 +227,6 @@ $(document).ready(function() {
     return false;
   });
 
-
   jQuery('#applyAction').click(function() {
 		var action = jQuery('[name="selectAction"]').val();
 		if (action == 'delete_derivatives') {
@@ -597,7 +597,7 @@ UL.thumbnails SPAN.wrap2 {ldelim}
 
     <!-- delete -->
     <div id="action_delete" class="bulkAction">
-    <p><label><input type="checkbox" name="confirm_deletion" value="1"> {'Are you sure?'|@translate}</label></p>
+    <p><label><input type="checkbox" name="confirm_deletion" value="1"> {'Are you sure?'|@translate}</label><span class="errors" style="display:none">{"You need to confirm deletion"|translate}</span></p>
     </div>
 
     <!-- associate -->{* also used for "move" action *}
diff --git a/include/ws_functions/pwg.images.php b/include/ws_functions/pwg.images.php
index 1d9d0cbd4..b6647c8b5 100644
--- a/include/ws_functions/pwg.images.php
+++ b/include/ws_functions/pwg.images.php
@@ -1739,6 +1739,13 @@ function ws_images_delete($params, $service)
   include_once(PHPWG_ROOT_PATH.'admin/include/functions.php');
   delete_elements($image_ids, true);
   invalidate_user_cache();
+
+  if ($params['return_details'])
+  {
+    return array(
+      'nb_processed' => count($image_ids),
+      );
+  }
 }
 
 /**
@@ -1760,4 +1767,4 @@ function ws_images_checkUpload($params, $service)
   return $ret;
 }
 
-?>
\ No newline at end of file
+?>
diff --git a/ws.php b/ws.php
index 1aff64897..16329635b 100644
--- a/ws.php
+++ b/ws.php
@@ -504,6 +504,7 @@ function ws_addDefaultMethods( $arr )
       array(
         'image_id' =>   array('flags'=>WS_PARAM_ACCEPT_ARRAY),
         'pwg_token' =>  array(),
+        'return_details' => array('default'=>false, 'type'=>WS_TYPE_BOOL),
         ),
       'Deletes image(s).',
       $ws_functions_root . 'pwg.images.php',
@@ -1024,4 +1025,4 @@ enabled_high, registration_date, registration_date_string, registration_date_sin
     );
 }
 
-?>
\ No newline at end of file
+?>