In a form I am working on  i have the following requirement.

One of the fields in the form is Date

Another field is Post_Code

Another is Map

Now lets say I have 6 records that have say 6/4/2013

Google maps uses the format  https://maps.google.com/maps?q=from:sl45sf:to:da81hg:to:me103de

Now what I am trying to do is when ever I make a change to the Date field doesn't matter if I am creating a record or amending one I want the map field for each record with the same date to recreate the same entry.

so input.Map = " https://maps.google.com/maps?q=from:sl45sf:to:" + post code of the first entry with the same date + ":to:" + post code of the second entry with the same date + ":to: + post code of the third entry with the same date and so on.

Hope this makes sense

Thanks

Nigel