--- auto_image_handling.js	2009-07-01 21:04:34.000000000 +0200
+++ auto_image_handling.js.linksunten	2009-07-01 17:51:54.000000000 +0200
@@ -128,6 +128,11 @@ function lightbox2_init_triggers(classes
         // Set the href attribute.
         else if (settings.image_node_sizes != '()' && !custom_class) {
           href = $(child).attr("src").replace(new RegExp(settings.image_node_sizes), ((settings.display_image_size === "")?settings.display_image_size:"."+ settings.display_image_size)).replace(/(image\/view\/\d+)(\/[\w\-]*)/, ((settings.display_image_size === "")?"$1/_original":"$1/"+ settings.display_image_size));
+          // Don't create preview link if preview image does not exist 
+	  // because original image size is smaller than preview image size
+          if (settings.display_image_size !== "") {
+            href = href.replace(new RegExp("."+settings.display_image_size), "");
+          }
           if (rel_type != "lightbox_ungrouped" && rel_type != "lightframe_ungrouped") {
             rel = rel_type + "[node_images]";
             if ($(child).parents("div.block-multiblock,div.block-image").attr("class")) {