-function previewURL(identifier, bookId, page) {
- return common.testHost + '/download/' + identifier + '/page/' + bookId + '_' + page + '.jpg';
+function previewURL(identifier, subPrefix, page) {
+ var imageURL = common.testHost + '/download/' + identifier;
+ var bookPrefix = identifier;
+ if (subPrefix) {
+ imageURL += '/' + subPrefix;
+ var subPrefixParts = subPrefix.split('/')
+ bookPrefix = subPrefixParts[subPrefixParts.length - 1];
+ }
+ imageURL += '/page/' + bookPrefix + '_' + page + '.jpg';
+ return imageURL;