Tranferring on "select list" value to another "select list" value

We have a drill through feature in our application where the user clicks on a value on page 1 and is taken to page 2. (e.g. the user drills on EUROPE in the REGION column on page 1 and is taken to page 2 where they see a report by countries in EUROPE.)
We also have identical SELECT LISTS on page 1 and on page 2 for REGION (EUROPE, NORTH AMERICA, ASIA). How do we program our application so that when the user clicks on EUROPE on page 1 and is taken to page 2 the value of EUROPE from the REGION SELECT LIST on page 1 is chosen in the REGION SELECT LIST on page 2?
We tried embedding this in the url for the drill through but the REGION SELECT LIST value on page 2 didn't change.
In the below link shouldn't the value of the REGION SELECT LIST named P2_REGION be assigned the current value of the REGION SELECT LIST called P1_REGION? (in this case 'EUROPE')
Thanks for help on this. John Wisnieff
f?p=&APP_ID.:102:#APP_SESSION#::::P102_PRG1_LINK:#P1CAMP_NAME#,P2_REGION:&P1_REGION

It would be great to get quick reply on this as we have a project due soon. I just need an answer to the below question:
In the below link shouldn't the value of the REGION SELECT LIST named P2_REGION be assigned the current value of the REGION SELECT LIST called P1_REGION? (in this case the value is 'EUROPE')
f?p=&APP_ID.:102:#APP_SESSION#::::P102_PRG1_LINK:#P1CAMP_NAME#,P2_REGION:&P1_REGION

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