Display text when Image won't load.

Need to fill space Norton Ad blocker creates

[NorthernStudio]

I need a method of displaying some text when Norton Ad Blocker blocks affiliate images, creating a sidebar consisting of nothing. Discussions of how this may affect the site's future existence aside, I need a method of putting that space to some good use.
Using the ALT="some text" isn't an option as Norton blocks even that.
Any ideas appreciated. Thanks

Edited: Spelling

[Birdman]

You could try making your alternate text into an image the same size as the ad and then use the image as a background on the ad's containing element(<td>,<div> etc).

Example:
<td style="background: url(/images/alt_text.gif);">Your ad code here</td>

[NorthernStudio]

Thanks Birdman,

Ashamed I didn't think of it myself. As usual, I looked past the obvious for the complicated solution. I had even been looking back at the old Netscape LAYER tags.