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You need to reverse your selection. I mentioned that in my tutorial. I did not think I needed to explain any further. 

When you have a selection, deleting will remove anything within that selection.

So.........if your selection looks like this......

[ATTACH]64321[/ATTACH]

....and you hit delete. This is the result.

[ATTACH]64322[/ATTACH]

This is not what you want.

This is the reversed selection.

Notice there are marching ants on the inside as well as the outside.

[ATTACH]64323[/ATTACH]

As shown by the red area, everything within the selection will be deleted.

[ATTACH]64324[/ATTACH]

So when you hit delete, your result will be this......

[ATTACH]64325[/ATTACH]

Good luck.