Here's a quick solution; simply change the code in topic.asp to display the icon you posted for those members who have no avatar selected.
Find the following code in topic.asp:
if Reply_MemberAvatar <> "noavatar.gif" then
response.write" <img src=""" & Reply_MemberAvatar & """ width=""" & intAvatarWidth & """ height=""" & intAvatarHeight & """ border=""" & intAvatarBorder & """><br /><br />"
end if
and replace it with the following code:
if Reply_MemberAvatar <> "noavatar.gif" then
response.write" <img src=""" & Reply_MemberAvatar & """ width=""" & intAvatarWidth & """ height=""" & intAvatarHeight & """ border=""" & intAvatarBorder & """><br /><br />"
else
response.write" <img src=""path_to_your_no_avatar_image"" width=""" & intAvatarWidth & """ height=""" & intAvatarHeight & """ border=""" & intAvatarBorder & """><br /><br />"
end if
Now find the following code:
if Member_Avatar <> "noavatar.gif" then
response.write" <img src=""" & Member_Avatar & """ width=""" & intAvatarWidth & """ height=""" & intAvatarHeight & """ border=""" & intAvatarBorder & """><br /><br />"
end if
and replace it with the following code:
if Member_Avatar <> "noavatar.gif" then
response.write" <img src=""" & Member_Avatar & """ width=""" & intAvatarWidth & """ height=""" & intAvatarHeight & """ border=""" & intAvatarBorder & """><br /><br />"
else
response.write" <img src=""path_to_your_no_avatar_image"" width=""" & intAvatarWidth & """ height=""" & intAvatarHeight & """ border=""" & intAvatarBorder & """><br /><br />"
end if
Replace the red code with the path/url to the image you want to display for members without avatars.