Find dates associated with Week # returned from DatePart(wk,DATEVALUE) function

I am trying to find the minimum and maximum date values associated with a specific week # that is returned from the DatePart(wk,SomeDate) function.

I would guess that a function would be the best bet. Anyway, what I'd like to do is pass in a week # - let's say that I have a sale that occurred on 1/15/08 and if I leave Set DateFirst at 7 I would get a value of 3 from that function - and get a week range label (varchar) in return. That label should reflect the lower and upper bounds of week #3 in tems of actual dates. So, the output should be something (I can always tinker with the formatting) like this:
1/13/2008 - 1/19/2008





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-- Here's sort of what I have in mind
CREATE FUNCTION GetWeekRange (@week_number smallint)
	
RETURNS VARCHAR(25)
 
BEGIN
	DECLARE @week_range varchar(25)
		,@min_range datetime
		,@max_range datetime
 
	-- PSEUDO
	-- Do something here though I have
	-- No idea how to get the range values
	SET @min_range = SELECT Something WHERE Something 
	SET @max_range = SELECT Something WHERE Something
		
	SET @week_range = CONVERT(varchar,@min_range,101) + ' - ' + CONVERT(varchar,@max_range,101)
 
	RETURN @week_range
END