How To Let User To Select A Table To Run?

Query
SELECT s.contracttypename, sum(s.sumrtr*v.pct) AS [predicted $]
FROM sumrtr AS s, varcurve1 AS v
WHERE s.mdiff=v.monthodr and s.contracttypename=v.contracttypename
GROUP BY s.contracttypename;


I have varcurve1 varcurve2 varcurve3....
I want to provide a mean (interface?) for user to choose varcurve1 varcurve2 varcurve3 to run above query.

for eample if user choose varcurve1
the query will run

SELECT s.contracttypename, sum(s.sumrtr*v.pct) AS [predicted $]
FROM sumrtr AS s, varcurve1 AS v
WHERE s.mdiff=v.monthodr and s.contracttypename=v.contracttypename
GROUP BY s.contracttypename;

if user choose varcurve2
the query will run

SELECT s.contracttypename, sum(s.sumrtr*v.pct) AS [predicted $]
FROM sumrtr AS s, varcurve2 AS v
WHERE s.mdiff=v.monthodr and s.contracttypename=v.contracttypename
GROUP BY s.contracttypename;



is there a way to do that?

Thanks