New Lightbox displayError logic for Bootstrap 2.

themes/bootstrap/js/lightbox.js

@@ -189,9 +189,12 @@ var Lightbox = {
    */
   displayError: function(message) {
     var alert = $('#modal .modal-body .alert');
-    if (alert.length > 0) {
+    var html = $.parseHTML($('#modal .modal-body').html());
+    // Page with alert already present
+    if(alert.length > 0 && html.length > 1) {
       $(alert).html(message);
-    } else if($('#modal .modal-body').html() == vufindString.loading+"...") {
+    } else if($('#modal .modal-body').html() == vufindString.loading+"..."
+    || (html.length == 1 && $(html).hasClass('alert-error'))) {) {
       $('#modal .modal-body').html('<div class="alert alert-error">'+message+'</div><button class="btn" onClick="Lightbox.close()">'+vufindString['close']+'</button>');
     } else {
       $('#modal .modal-body').prepend('<div class="alert alert-error">'+message+'</div>');