diff --git a/static/sdk.js b/static/sdk.js
index 1df061d..db436d9 100644
--- a/static/sdk.js
+++ b/static/sdk.js
@@ -65,13 +65,24 @@ var contented = (function() {
 		},
 		
 		"getPreviewURL": function(id) {
-			return baseURL + "get/" + id; // n.b. there's no better preview URL yet
+			return baseURL + "get/" + encodeURIComponent(id); // n.b. there's no better preview URL yet
 		},
 		"getDownloadURL": function(id) {
-			return baseURL + "get/" + id;
+			return baseURL + "get/" + encodeURIComponent(id);
 		},
 		"getInfoJSONURL": function(id) {
-			return baseURL + "info/" + id;
+			return baseURL + "info/" + encodeURIComponent(id);
+		},
+		"getThumbnailURL": function(thumbnailType, id) {
+			return baseURL + "thumb/" + encodeURIComponent(thumbnailType) + "/" + encodeURIComponent(id);
+		},
+		"thumbnail": {
+			"small_square": "s",
+			"medium_square": "b",
+			"medium": "t",
+			"large": "m",
+			"xlarge": "l",
+			"xxlarge": "h"
 		}
 	};