Syntax Error On Where Clause

I have the code below and the where clause is giving me errors, I have already setup FT Index, I think the error is lack of ' or " or "" or some kinda syntax pls help... as I can figure it out





I passed the word MBAISE











where CONTAINS(*, '+@searchstring+' )








Declare @myStatement varchar(8000)


Declare @LastRec int


Declare @FirstRec int


SELECT @FirstRec = (@CurrentPage - 1) * @PageSize


SELECT @LastRec =(@CurrentPage * @PageSize + 1 )





SELECT @myStatement = ' SELECT SalaryStatistical, EmployerID,JobLocation, location, SectorID


FROM #TEMP





where CONTAINS(*, '+@searchstring+' )





AND (LastLogin >= dateadd(d, -' + @HowManyDays + ', getdate())


AND (ID > '+ convert(varchar(20),@FirstRec) +')


AND (ID < '+convert(varchar(20),@LastRec) +')


AND (SalaryStatistical > '+ convert(varchar(20),@SalaryStatistical)+')





'


IF @JobLocation != @myzero





BEGIN


SELECT @myStatement = @myStatement + ' AND (JobLocation IN ('+convert(varchar(90),@JobLocation)+')) '


END





IF @sectorID != @myzero


BEGIN


SELECT @myStatement = @myStatement + ' AND (SectorID IN ('+convert(varchar(90),@sectorID)+')) '


END





SELECT @myStatement = @myStatement


print @myStatement





exec(@myStatement)








GO