+    var dialog_width    = 800;
+    var dialog_height   = 500;
+    var textarea_width  = 750;
+    var textarea_height = 220;
+    if (this.longdescription_dialog_size_percentage != 0) {
+      dialog_width    = Math.ceil(window.innerWidth  * this.longdescription_dialog_size_percentage/100);
+      dialog_height   = Math.ceil(window.innerHeight * this.longdescription_dialog_size_percentage/100);
+      textarea_width  = Math.ceil(dialog_width * 95/100);
+      textarea_height = dialog_height - 220;
+      if (textarea_height <= 0) textarea_height = 220;
+    }
+