diff --git a/api/resizeImages.js b/api/resizeImages.js
index 28b326ac..c49b0ecc 100644
--- a/api/resizeImages.js
+++ b/api/resizeImages.js
@@ -19,8 +19,11 @@ var $ = Mobify.$
         var bits = [defaults.host];
 
         if (defaults.projectName) {
-            var projectId = "project-" + defaults.projectName;
-            bits.push(projectId);
+            bits.push("project-" + defaults.projectName);
+        }
+
+        if (options.cacheHours) {
+            bits.push('c' + options.cacheHours);
         }
 
         if (options.format) {
@@ -28,7 +31,7 @@ var $ = Mobify.$
         }
 
         if (options.maxWidth) {
-            bits.push(options.maxWidth)
+            bits.push(options.maxWidth);
 
             if (options.maxHeight) {
                 bits.push(options.maxHeight);
diff --git a/tests/index.html b/tests/index.html
index 7fcef2ec..c0e94c89 100644
--- a/tests/index.html
+++ b/tests/index.html
@@ -449,6 +449,15 @@ <h2 id="qunit-userAgent"></h2>
             equal(got, vow);
         });
 
+        test('Mobify.getImageURL cached string', 2, function() {
+            var url = 'http://test/image.jpg';
+            var result1 = Mobify.getImageURL(url, {maxWidth: '320', cacheHours: '8'});
+            var result2 = Mobify.getImageURL(url, {maxWidth: 320, cacheHours: 8});
+            var expected = '//ir0.mobify.com/c8/320/' + url;
+            equal(result1, expected);
+            equal(result2, expected);
+        });
+
         test('Mobify.getImageURL - projectName set on Mobify.conf.data', function() {
             expect(1);
 
@@ -464,6 +473,22 @@ <h2 id="qunit-userAgent"></h2>
             }
         });
 
+        test('Mobify.getImageURL - projectName and cache expiry set', function() {
+            expect(1);
+
+            try {
+                Mobify.$.fn.resizeImages.defaults.projectName = 'testing';
+
+                got = Mobify.getImageURL('http://test/image.jpg',
+                    {maxWidth: 320, cacheHours:8});
+                vow = "//ir0.mobify.com/project-testing/c8/320/http://test/image.jpg";
+
+                equal(got, vow);
+            } finally {
+                delete Mobify.$.fn.resizeImages.defaults.projectName;
+            }
+        });
+
 
         module('enhance');
 
@@ -571,15 +596,15 @@ <h2 id="qunit-userAgent"></h2>
 
         urlmatch = Mobify.urlmatch;
 
-        /* 
-        * Takes a path, an urlmatch path expression or regular expression and an 
-        * expectation about whether these should match and calls qunit's 
-        * `equal()` on the result of running urlmatch with the given expression 
+        /*
+        * Takes a path, an urlmatch path expression or regular expression and an
+        * expectation about whether these should match and calls qunit's
+        * `equal()` on the result of running urlmatch with the given expression
         * window.location faked to the given path on http://a.com/
         */
         testUrlMatch = function(path, expression, expected) {
             var match, matched, symbol, url;
-            
+
             // Set up urlmatch with a mocked window object with a mocked location object
             // set to `url`
             url = "http://a.com" + path;
@@ -589,10 +614,10 @@ <h2 id="qunit-userAgent"></h2>
             matched = !!match();
             symbol = (expected != false ? "☑": "☒");
 
-            expression = (typeof expression === 'string' ? 
+            expression = (typeof expression === 'string' ?
               '"' + expression + '"' : expression);
 
-            equal(matched, expected, 
+            equal(matched, expected,
               symbol + " : " + path + " : " + expression);
         };
 
@@ -626,7 +651,7 @@ <h2 id="qunit-userAgent"></h2>
             testUrlMatch("/abb/c", "/a.b/c", false);
             testUrlMatch("/aab/c", "/a+b/*/", false);
             testUrlMatch("/a$b/c", "/a$b/*", true);
-              
+
             // RegExp test suite
             testUrlMatch("/a", /a/, true);
             testUrlMatch("/a/", /^\/a\//, true);
@@ -636,9 +661,9 @@ <h2 id="qunit-userAgent"></h2>
             testUrlMatch("/a/some/other/other/stuff/b/", /^\/a.*b(\/)?$/, true)
 
             // Things other than path expressions and RegExps
-            equal(urlmatch({}), false, 
+            equal(urlmatch({}), false,
               "passing the empty object to urlmatch makes it return false");
-            equal(urlmatch("/a/b/c")(5), false, 
+            equal(urlmatch("/a/b/c")(5), false,
               "passing a number to urlmatch makes it return false");
         }); //test