To download a Toontown icon just click the icon image size that you want to download, then:
For Internet Explorer: Right-click on the image that pops-up and select "Save Picture As..."
For Firefox: Right-click on the image that pops-up and select "Save Image As..."
For Safari: Click on the image that pops-up and drag it to your Desktop
Next, save the icon image to your Desktop so you can easily find it.
Then, follow your instant messenger program instructions to complete the installation.
AOL Instant Messenger: 48x48
MSN Messenger: 96x96