Compare String Value In Sqlserver 2005

CREATE FUNCTION [dbo].[Compare]
(
@usrVal varchar(100),
@dbVal varchar(100)
)
RETURNS BIT
AS
BEGIN
DECLARE @flag BIT
DECLARE @userStrLen INT
DECLARE @dbStrlen INT
DECLARE @counter INT
--Default assignments
SET @counter=1
Set @userStrLen=len(@usrVal)
Set @dbStrlen=len(@dbVal)

IF (@userStrLen != @dbStrlen)
BEGIN
return 0
END
ELSE
BEGIN
WHILE @counter <= @userStrLen
BEGIN
IF (substring(@usrVal,@counter,1) != substring(@dbVal,@counter,1))
RETURN 0
SET @counter = @counter + 1
END
return 1
END
RETURN @flag
--SELECT dbo.Compare('sqlserver user defined functions','sqlserver is the best backend')
END