DB Login Security

i was randomly lookin on 4 Guys From Rolla or sumfin and went to the ASP FAQs site and found this:
http://www.aspfaqs.com/aspfaqs/ShowFAQ.asp?FAQID=197

but i dont understand it....

i dont understand how a hacker can do this.... as my "users" wouldnt ever get "his" link could sumone please explain it a lil better to me?

and id also like to know other ways i can secure my login

thanks

(PS: yes i've already put the DB below the htdocs bit)

yeah thats wot i was thinkin

cose on my site i have

<%if request.querystring("error") = "Yes" then response.write("Your Username or Password was wrong, Please try again")%>

so how could they put the HTML into it, and also, like i said, i dont see how you get the "hackers" link anyway.... is it on there site or sumfin

which i doubt my users would see the "hackers" site thought

which is why i asked about this

yeah you only need to worry about it if you always try to print a querstring value

simple way to overcome it is simply hav e a error library, so if user ocomes accros error do redirect("error.asp?e=1") and if e=1 then response.write, that way people cant print their own code