T-SQL (SS2K8) :: Comparing Column Values In Same Table

How to resolve the below task

create table #temp ( idx int identity(1,1), col1 int, col2 int )

Here i want a flag success or fail on basis of below conditions.

I need to take all the col1 values and then i need to compare to each other.

if any difference found, i need to check difference more than 30, then it should raise the flag as "Failure".

if all the col1 values are ok , then we need to check Col2 values same as above.

--case 1

insert into #temp(col1,col2)
select 16522,18522
union all
select 16522,18522
union all
select 16582,18522

--select * from #temp

--truncate table #temp

Because of difference in col1 values . the value of flag should be fail.

--case 2

insert into #temp(col1,col2)
select 16522,18522
union all
select 16522,18522
union all
select 16522,17522

Here also the col1 is ok but col2 values have difference so it should be Fail.

Otherwise it should be success.