You should be somewhat familiar with Greasemonkey to do this, as you will in essence be creating your own script for your player.
Now before we get started, you'll need to find the player ID of who you want to track on the replay. You can do that by clicking on any of your players on your home page. You'll see their ID at the end of the URL: "player_id=265367" or something. Save that number.
You'll also need a 16x16 image you want to show up for your player.
I'm using just a colored red circle with my player's initial on it, but you can put anything really. Just make sure it is 16x16 so it fits with the others in the replay. It should have some transparency if you want to make it a circle. Upload it to a server somewhere and save that URL.
Now, in Firefox go to Tools>Greasemonkey>New User Script...
For name, enter the name of your player
Put anything for Namespace (I put GLB for GoalLineBlitz)
You can put any description. Something like "Custom icon on replay for player XYZ"
For the includes, remove anything currently there, and add "
http://goallineblitz.com/game/replay.pl?pbp_id=* " (no quotes)
It may ask you to browse for a text editor if you don't have one associated - browse to notepad or something similar.
It will open up a text file with a few lines at the top. Underneath those, put the following code:
window.setTimeout( function()
{
if(document.getElementById('#######')){
document.getElementById('#######').innerHTML = '<img src="
http://www.whatever.com/imageurl.png">';
}
}
)
Replace the ###### in the two places with your player user ID you saved earlier. Replace the URL with the path to your image. Save that file. Next time you watch a replay, your player will have a custom icon.