--- a/uilib.py	Thu Aug 12 15:58:42 2010 +0200
+++ b/uilib.py	Thu Aug 12 16:50:52 2010 +0200
@@ -46,6 +46,11 @@
     """
     return 'Any X WHERE X eid %s' % eid
 
+def eid_param(name, eid):
+    assert eid is not None
+    if eid is None:
+        eid = ''
+    return '%s:%s' % (name, eid)
 
 def printable_value(req, attrtype, value, props=None, displaytime=True):
     """return a displayable value (i.e. unicode string)"""