Great approach and very easy to implement - good job!

Such a simple idea. Gotta love it.

I like the idea of using variables instead of the quotes.  But not the part about the ASCII characters.  The solution below works best for me:

Declare @q char(1)
Set @q = ''''

The value in the Set statement is four (4) characters, all single quotes.

Good article, but it makes me yearn all the more for database-global constants (they don't have them in 2000, I wonder if they're in 2005...)