When user clicks on "select shipping method" and shipping address is empty.

[uriben]

Hello,
I'm using joomla version: 2.5.9, and Virtuemart version 2.0.2.

This is my first time posting in this forum, I searched before posting here if there an answer to my issue, and I didn't find one.

I would like to configure the shipment method by country..
I.E. If the shopper is from the US, he will see only shipment related to US
else, only international shipment will be shown.

The issue
If I configure country as a rule in the shipment configuration.
When the shopper goes straight to "select shipment method" without first inserting shipment information -  he wont see any shipment methods there...

What I would like him to see is an error message - "Please, insert your shipment information first".

How and where do I fix this issue, I have minor experience in coding, but with detailed answer I'll menage.

Thank you!!