Does anyone know how to size an image when using <<SITE_ICON>>. As of now, when the customer enters the link to an image, the image shows up at the actual image size. I need to keep the image sizes uniform, say 100 x 100

What I have done with mine is to make sure that only a specific size is used, to do that I host the image.

In your case this may help:

<td width="100" height=“100“><<DESC_ICON>></td>

Worth a try.