Conditional Union Possible?

I'm trying to achieve something like the following:


SELECT 'page' as type, page_filename as filename, page_title as title, page_metadescription as intro
FROM tbl_pages
WHERE CONTAINS(*, @searchterm)

IF 1=1 BEGIN
UNION all

SELECT 'news' as type, 'thiswillbeafilename.asp' as filename, news_title as title, news_intro as intro
FROM tbl_news
WHERE CONTAINS(*, @searchterm)
END
IF 2=2 BEGIN
UNION ALL

SELECT 'resource' as type, resource_filename as filename, resource_longtitle as title, resource_summary
FROM tbl_resources
WHERE CONTAINS(*, @searchterm)
END


I'm pretty sure this isn't possible using the approach i have here, however is there an different method i can use to ahcieve the same effect other than using dynamic sql?

Cheers,