Url redirect based on passing parameter

Question

I have one requirement like this
I have a table CUSTOMER in that CUSTID,NAME,URL columns is thier
CUSTID NAME URL
1 asp www.asp.net
2 weblog www.weblogs.asp.net
3 google www.google.com
 
My question is I opening perticular url based on CUSTID
 
I am Passing parameter Like www.Example.com?CUSTID=1 That
 
corressponding URL data(Ex:www.asp.net) It will open directly in browser
 
using asp.net........
plz help me ...........
Thank you,
anil