diff --git a/paramecio/cromosoma/extrafields/urlfield.py b/paramecio/cromosoma/extrafields/urlfield.py
new file mode 100644
index 0000000..c6caa49
--- /dev/null
+++ b/paramecio/cromosoma/extrafields/urlfield.py
@@ -0,0 +1,25 @@
+from paramecio.cromosoma.corefields import CharField
+import re
+
+check_url = re.compile(
+        r'^(?:http|ftp)s?://' # http:// or https://
+        r'(?:(?:[A-Z0-9](?:[A-Z0-9-]{0,61}[A-Z0-9])?\.)+(?:[A-Z]{2,6}\.?|[A-Z0-9-]{2,}\.?)|' #domain...
+        r'localhost|' #localhost...
+        r'\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})' # ...or ip
+        r'(?::\d+)?' # optional port
+        r'(?:/?|[/?]\S+)$', re.IGNORECASE)
+
+class UrlField(CharField):
+    
+    def check(self, value):
+        
+        self.error=False
+        self.txt_error=''
+        
+        if not check_url.match(value):
+            
+            self.error=True
+            value=""
+            self.txt_error='No valid URL format'
+            
+        return value
diff --git a/paramecio/index.py b/paramecio/index.py
index 46b702b..1767dbd 100644
--- a/paramecio/index.py
+++ b/paramecio/index.py
@@ -30,7 +30,7 @@ if config.yes_static==True:
         
         path=workdir+'/themes/'+config.theme+'/media/'+module
         
-        file_path=path+filename
+        file_path=path+'/'+filename
         
         if os.path.isfile(file_path):
             mimetype=guess_type(path+'/'+filename)